Freediving Neck Weights

Dyno Neck Weight 4.0 kg for Freediving – Modular Weight System

The Dyno Neck Weight in 4.0 kg, designed by C4, is a weight system specifically developed for spearfishing and freediving. Its hydrodynamic shape reduces bulk and does not overload the neck during finning, improving efficiency and fluidity of underwater movement.

Design and Comfort

The neck weight is made up of semi-mobile segments that adapt to the movement of the thoracic vertebrae, ensuring full joint freedom with no restriction of movement. This feature increases comfort during the dive while keeping the weight concentrated close to the balance point of buoyancy forces, optimizing trim in the water.

Modularity and Weight Customization

The segments, with varying weights, are easy to assemble and disassemble thanks to axles with locking screws. This allows the load to be precisely customized according to the specific needs of the freediver or spearfisher.

• Additional 280-gram Dyno segments available separately to increase weight
• Easy assembly and adjustment according to the dive profile

Technical Features

• Type: modular neck weight system for freediving
• Standard total weight: 4.0 kg
• Shape: optimized for hydrodynamics and neck comfort
• Materials: mechanically strong and durable
• Color: black

Benefits for Freedivers and Spearfishers

The Dyno Neck Weight improves thrust transmission during freediving thanks to the well-distributed weight near the body’s center of gravity. Its modular structure contributes to a customized trim, enabling smoother and less tiring underwater movement, with optimized neck comfort and minimized inertia.

Lobster Collar Segments Specifically for Freediving

The segments for the Lobster collar are designed to meet the needs of spearfishing and freediving, ensuring proper balance during dives.

Technical Features

• Available in 5 different weights: 100 g, 200 g, 300 g, 400 g, and 500 g, for precise ballast customization
• Black color for a discreet profile underwater
• Modular assembly system with rubber inserts
• Semi-mobile movement between segments that follows the articulation of the vertebrae

Benefits for the Freediver

The fastening system allows the segments to be combined according to the required weight, enabling gradual and optimal adjustment for in-water trim.

The semi-mobility of the individual segments, ensured by the rubber inserts, promotes the natural flexibility of the spine without limiting freedom of movement during a dive. This feature helps maintain an ergonomic and comfortable trim during spearfishing or freediving.

Applications

• Adaptable to different ballast requirements for freediving and spearfishing
• Ideal for freedivers who need customized, dynamic balance
• Compatible with the Lobster collar, used to improve stability and trim while diving

Lobster Neck Weight Segments Designed for Freediving

The segments for the Lobster neck weight are designed for freediving, with an innovative fastening system that allows the freediver to combine and assemble the segments according to their own weight and shape requirements.

The fastening mechanism uses rubber inserts that make the segments semi-mobile, allowing them to adapt to vertebral movement without limiting spinal mobility during freediving dives.

Technical Features

• Available in 5 different weights: 100 g, 200 g, 300 g, 400 g and 500 g, allowing modular, customized assembly.
• Variable size and weight to optimize trim in the water.
• Rubber inserts to ensure flexibility and adaptability to the natural curve of the back.
• Color: visible and identifiable red.

This modular system allows precise adjustment of the load on the neck weight, improving efficiency and comfort during breathing and underwater movement typical of spearfishing and freediving.

Lobster Neck Weight Segments Specifically for Freediving

The Lobster neck weight segments are designed specifically for freediving, offering a modular system that adapts to the needs of spearfishers or freedivers. Their structure allows the weight to be adjusted as needed by combining individual segments.

Technical Features and Functionality

• Available in 5 different weights: 100, 200, 300, 400, and 500 grams for precise balancing
• Innovative fastening system with rubber inserts for quick installation and removal of the segments
• Semi-mobile segments that follow the joint movements of the cervical vertebrae to ensure freedom of movement of the spine during freediving
• Adaptability to the curves of the back thanks to the flexibility of the connection mechanism
• Color: Dark Blue for a discreet, functional look underwater

Benefits for Freediving and Spearfishing

Thanks to the ability to customize the additional load, the segments allow precise weight balancing, improving underwater trim without compromising freedom of movement in the neck and back. The semi-mobile design ensures that the neck weight adapts perfectly to the freediver’s physiology, helping reduce fatigue and stiffness during the dive.

Applications

Ideal for integration into the Lobster neck weight used in spearfishing, these segments provide a modular solution for optimizing load and mobility, key aspects for effective underwater activity that respects personal biomechanics.

Weighted Cordura Pouch for Freediving Neck Weight

The freediving neck weight pouch is made of Cordura, a highly durable and water-resistant material, ideal for underwater use in spearfishing and freediving environments. Inside, it is filled with nickel-plated lead shot, whose nickel-plated finish effectively prevents oxidation, ensuring long-lasting durability and reliability even in marine environments.

Technical Features

• Outer material: Cordura, resistant to wear and the corrosive effects of saltwater
• Filling: nickel-plated lead shot to prevent corrosion and maintain consistent weight
• Function: balancing weight for neck weight, optimized for the specific needs of freediving and spearfishing

Available Weight Options

• 250 grams
• 500 grams
• 1 kilogram

These weighted pouches are designed to provide customized balance during freediving dives, making buoyancy control easier and improving underwater stability through modular weight distribution.

280-Gram Segment for C4 Dyno Freediving Neck Weight

This 280-gram segment is designed specifically for the C4 Dyno neck weight, a technical device dedicated to freedivers. Made from durable materials and finished in black, the segment integrates into the modular system to provide a customizable and functional solution during freediving activities.

Technical Features

• Screw fastening: The system allows multiple segments to be combined, enabling a configuration that adapts to the individual needs of the freediver.
• Semi-mobile movement: Once fastened, the segments retain a degree of mobility, following the natural curve of the vertebrae and ensuring no restrictions on spinal movement.
• Material and weight: The segment weighs 280 grams, offering a good balance between durability and lightness, ideal for avoiding unnecessary load on posture during a dive.
• Color: Black, for a clean, understated look and good integration with spearfishing gear.
• Complete package: The product is supplied with pin and screw for immediate attachment to the C4 Dyno neck weight.

Functionality and Benefits

The modular, semi-moving design of the segment is intended to maintain freedom of movement of the spine during freediving dives, reducing possible discomfort or restriction. The structure allows optimal gear customization, improving comfort and practicality in everyday use.

Lobster Carrying Bag for Complete Collar Set

The Lobster bag is specifically designed for the safe and efficient transport of the Lobster collar and its segments.

Made with durable materials and high-quality finishes, it ensures excellent mechanical resistance over time, providing protection and reliability during transport and freediving sessions.

The functional design of the bag makes it easy to organize the collar set, optimizing ease of use while maintaining the integrity of the components.

Main features:

• Robust, wear-resistant materials
• Premium finishes for increased durability
• Black color, ideal for underwater equipment
• Compact and lightweight, easy to carry

1 Kg Segment for C4 Dyno Neck Weight – Freediving Gear

The 1 Kg segment is specifically designed for use with the C4 Dyno neck weight, an essential component in freediving and spearfishing gear. This segment lets you customize the neck weight in a modular way, ensuring precise adjustment to the freediver’s needs.

Technical features

• Weight: 1 kilogram
• Material: durable and suitable for underwater use
• Color: Black
• Attachment system: screw with axle included for secure, easy assembly
• Modularity: multiple segments can be combined and assembled to adjust the overall weight

Functionality and benefits

The screw attachment system ensures the segments are semi-mobile, allowing them to follow the natural movements of the spine without restricting freedom of movement. This feature improves comfort during the dive, maintaining balanced, stable trim in the water.

The system’s modularity allows the freediver to precisely customize weight distribution based on diving style and specific conditions, optimizing efficiency and underwater maneuverability.

4.0 kg Lobster Neck Weight for Freediving and Spearfishing

The Lobster Neck Weight at 4.0 kg is a modular weight system designed specifically for freediving and spearfishing. It consists of a 2.5 kg main neck weight and five additional segments of varying weight, designed to provide optimal trim close to the diver’s buoyancy balance point.

Technical and Functional Features

• Hydrodynamic design: the shape of the neck weight has been engineered to minimize water resistance, promoting a smooth swim with no overload on the neck.
• Semi-mobile segments: the five additional segments, secured with rubber inserts, adapt to the movement of the thoracic vertebrae, ensuring maximum freedom of movement and no restriction during the dive.
• Modularity: the segments are easy to remove and assemble, allowing you to customize the neck weight load according to individual needs.
• Segment weights: 500 g, 400 g, 300 g, 200 g, 100 g for precise adjustment of the total weight.
• Fastening materials: rubber inserts that ensure a stable hold while remaining easy to install and remove in the water.
• Color: Dark Blue, ideal for use in the underwater environment.

Benefits for Freediving and Spearfishing

Positioning the weight close to the balance point makes body trim easier during freediving descents, reducing neck fatigue and improving finning efficiency. The semi-soft, modular structure allows for a customized fit, meeting the specific needs of every freediver and spearfisher.

Lobster Carrying Bag for Complete Collar Set

This Lobster bag is specifically designed for carrying the Lobster collar and all its segments, ensuring simple, secure transport of your freediving and spearfishing gear.

Made with strong, durable materials, the bag provides effective protection for its contents while on the move. High-quality finishing enhances overall robustness, making the product reliable over time, even in marine environments.

The practical design allows optimal organization of the collar set, preserving the integrity of each individual component.

• Color: Red
• Strong, durable materials
• High-quality finishing for mechanical resistance
• Specifically designed for the Lobster collar
• Reliable and resistant for frequent use in freediving and spearfishing

Lobster Collar Segments – Modular Weight for Freediving

The Lobster collar segments are designed specifically for freedivers, offering a modular weight solution for use during freediving and spearfishing sessions. Thanks to the innovative fastening system, the segments can be combined and assembled to achieve the ideal total weight, adapting it to individual needs.

Technical Features

• Modularity: the segments can be connected to each other with rubber inserts that allow semi-mobile movement, ensuring the collar follows the natural curve of the vertebrae without limiting spinal mobility.
• Weight availability: 5 different sizes from 100 to 500 grams (100, 200, 300, 400, 500 g) to customize distribution and load according to the freediver’s needs.
• Material and color: designed to ensure durability and strength, the segments are available in green, making them easy to integrate with freediving-oriented gear.

Benefits for Freediving and Spearfishing

The semi-mobile structure of the collar provides optimal ergonomics, maintaining freedom of movement of the spine during descent and ascent phases. This helps minimize muscle fatigue and improve comfort, while still keeping the weight effectively positioned on the body. The ability to adjust the load makes this system ideal for precise buoyancy management in the water.

Freediving Neck Weight - Lobster

The Lobster Neck Weight is a modular ballast system designed specifically for freediving, available in three weight configurations: 2.5 kg, 4.0 kg, and 6.0 kg. Its highly hydrodynamic shape is designed not to overload the neck while swimming and to position the weight close to the balance point of the body’s buoyancy forces during the dive, maximizing efficiency and comfort.

Modular System and Available Configurations

Each version consists of a fixed base and a series of removable additional segments, allowing you to customize the total weight according to your needs, the wetsuit used, and the discipline practiced.

• Lobster 2.5 kg: 1.5 kg base + 4 segments (400 g, 300 g, 200 g, 100 g)
• Lobster 4.0 kg: 2.5 kg base + 5 segments (500 g, 400 g, 300 g, 200 g, 100 g)
• Lobster 6.0 kg: 4.0 kg base + 6 segments (2 × 500 g, 400 g, 300 g, 200 g, 100 g)

Semi-Mobile Segments for Maximum Freedom of Movement

The semi-mobile segments of the Lobster Neck Weight follow the natural movement of the thoracic vertebrae, dynamically adapting to the freediver’s movements without limiting range of motion. This design ensures a proper diving posture, efficient breathing, and full freedom when finning, both in dynamic freediving and depth disciplines.

Fast and Easy Assembly

The segments use an interlocking system, secured with rubber inserts that make assembly and disassembly quick and easy. Segments can be added or removed at any time to adapt the total weight to the conditions of each outing or training session.

• Interlocking system with rubber inserts
• Tool-free assembly and disassembly
• Segments available separately to expand the configuration

Benefits for the Freediver

• Hydrodynamic profile that reduces drag during the dive
• Optimal weight distribution close to the balance point of buoyancy forces
• Reduced mechanical stress on the neck thanks to the ergonomic shape
• Mobile segments that do not restrict movement of the thoracic spine
• More efficient finning and natural posture during descent and ascent
• Precise load customization for dynamic, static, and depth freediving

D&D Neck Weight - Deep & Dynamic for Freediving and Spearfishing

The D&D Neck Weight represents the evolution of the C4 Dyno neck weight, designed specifically for freediving in both depth and dynamic disciplines. The name Deep & Dynamic reflects the product’s technical versatility, allowing the weight to be adjusted from 1 kg up to 4 kg in a single system adaptable to different diving needs.

Technical Features

• Made from lead coated with a layer of thermoplastic rubber to ensure mechanical strength and long-lasting durability.
• Highly hydrodynamic shape designed to reduce drag and minimize load on the neck, improving the fluidity of the fin kick and freedom of movement while freediving.
• Semi-mobile segments that follow the anatomy of the thoracic vertebrae, allowing a more natural, unrestricted trim while swimming.
• Modular system consisting of a main neck weight to which segments can be added or removed at the rear to vary weight and trim.
• Equipped with numbered plastic segments to make assembly easier and allow precise load adjustment.
• Integrated safety clips to prevent accidental loss of the segments during the dive.

Weight Configurations

The D&D Neck Weight is available in three configurations designed for different types of diving:

• 1.6 kg - ideal for deep dives, providing efficient balance while reducing bulk.
• 3 kg - neck weight equipped with 4 rear segments for an intermediate trim adaptable to more agile dynamics.
• 4 kg - full configuration with 5 rear segments for dynamic dives that require greater ballast load.

Benefits for Freedivers and Spearfishers

Thanks to its adjustable weight and distinctive ergonomic shape, the D&D Neck Weight significantly improves trim control during freediving and spearfishing. The weight load is optimized close to the center of buoyancy, ensuring better balance and greater movement efficiency.

The system’s adaptability with semi-mobile segments and the lightweight coating material contribute to excellent comfort during extended use and complete joint freedom.

Best Divers Freediving Neck Weight

The Best Divers Freediving Neck Weight is designed to optimize trim during freediving, transferring the center of gravity from the neck to the upper rear section of the lungs. Its elongated shape reduces load on the cervical area, improving balance and helping achieve a more stable, natural trim in the water.

Technical features and materials

• Made with high-quality materials: original Cordura outer shell for mechanical strength and durability, padded interior with Airnet Spacer Plus, a water-repellent material that ensures comfort and breathability.
• Two shaped weighted wings, filled with nickel-plated lead shot to prevent oxidation, keep the neck weight from rotating and ensure stability during the dive.
• The initial fixed weight is 1 kg, expandable with two reinforced pockets to add up to 2 kg more in 250-gram increments.
• The maximum achievable weight is therefore 3 kg, customizable according to the ideal weighting of the freediver or spearfisher.
• Lead shot available separately in 250 g, 500 g, and 1 kg sizes to fine-tune the neck weight to your trim.

Adjustment and closure

• The Velcro closure allows quick release, essential for safety in the water.
• The size is adjustable from 38 to 48 cm, ensuring a precise and comfortable fit.

Available colors

• Red
• Black

1 Kg Segment for Dyno C4 Neck Weight

Single 1 kg segment specifically designed for the Dyno C4 neck weight, developed for use in freediving and spearfishing. This component allows the neck weight to be customized modularly, thanks to the screw fastening system.

Technical Features

• Material and construction: built to ensure strength and durability during the dive.
• Screw fastening system: allows the segments to be assembled and combined precisely, adapting them to the individual needs of the freediver.
• Semi-mobile movement: the secured segments follow the natural movements of the spine without limiting flexibility, improving comfort and freedom of movement in the water.
• Color: red for easy identification and weight management.

Included in the Package

• 1 kg segment
• Fixing pin
• Screw for securely locking the segment onto the Dyno C4 neck weight

Lobster Neck Weight Base - Black

The Lobster neck weight base is designed to distribute weight optimally during dynamic apnea sessions, preventing overload on the freediver’s neck during the dive. Its highly hydrodynamic structure improves swimming efficiency, allowing you to cover greater distances with less fatigue.

Design and functionality

• Ergonomic shape that distributes weight toward the balance point of buoyancy forces
• Allows you to bring your hands together above your head for a smoother, more effective swim
• Modular segments in different weights and sizes to adjust the load according to your needs

Components and materials

Additional weights (not included with the base) are attached using silicone inserts, providing a secure yet flexible connection. This system allows the segments to follow the movement of the vertebrae without limiting mobility, ensuring comfort and freedom of movement.

Technical features

• Base weight: three different sizes (1.5 kg - 2.5 kg - 4.0 kg)
• Color: Black
• Additional weight modules (segments) sold separately
• Hydrodynamic design to reduce drag in the water while swimming

Benefits for freediving use

Lobster improves balance and helps maintain proper posture, increasing finning efficiency and reducing neck fatigue. The freedom of movement provided by the segmented system helps maintain fluid movement and comfort.

Lobster Collar Segments Specifically for Freediving

The Lobster collar segments are designed for freediving and allow a modular, customized weight configuration. Thanks to their innovative fastening system, the freediver can assemble the segments flexibly, adapting the collar to their spearfishing or freediving needs.

Technical Features and Functionality

• Available in 5 different weights: 100, 200, 300, 400, and 500 grams, for precise load management.
• Assembly system with rubber inserts that allows a semi-mobile connection between the segments.
• Design that follows the natural movement of the vertebrae, without limiting spinal flexibility during dives.
• Materials engineered to ensure mechanical strength and durability in the underwater environment.
• Yellow color, to improve visibility and identification in the marine environment.

Benefits for Freediving and Spearfishing

The modular segment system allows optimal, dynamic weight distribution, essential for:

1. Maintaining balanced trim during spearfishing.
2. Ensuring maximum freedom of movement for the spine.
3. Adapting to different ballast requirements based on dive conditions and individual experience.

Use Specifications

To customize the collar:

• Select the required segments according to the desired weight.
• Assemble the segments using the rubber inserts, avoiding excessive rigidity.
• Check that the collar ergonomically fits the shape of the spine to optimize comfort and freedom of movement.

Modular Neck Weight for Indoor Freediving Mares

Mares presents the Neck Weight, a modular weight system specifically designed for indoor freediving. This innovative neck weight lets you precisely adjust the weight directly in the pool, allowing quick buoyancy customization during freediving sessions.

The system consists of modular segments of 300 g each, featuring a functional, eye-catching design and connected by an adjustable Cordura strap. This configuration allows you to effectively vary the total load according to the freediver’s specific needs.

Main technical features

• Number of segments: 8
• Maximum total weight: 2.4 kg
• Cordura strap with easy quick-release system
• Modular weight adjustable directly in the water

The release system of the Neck Weight is designed to be easy and intuitive, improving freediver safety and helping comply with strict protocols during competitions or training drills. This neck weight is particularly suitable for experienced freedivers, instructors, and freediving schools, where the ability to adjust weight in just a few seconds optimizes work with students, speeds up lesson flow, and allows better buoyancy adaptation.

Benefits for indoor freediving practice

• Fast customization of the load during the session
• Buoyancy optimization to improve neck weight management
• Safety ensured by the quick and reliable release system
• Practicality and comfort thanks to the adjustable Cordura strap

D&D Collar - Deep & Dynamic for Freediving and Spearfishing

The D&D Collar, Deep & Dynamic, represents the evolution of the Dyno collar made by the C4 brand, designed specifically for freedivers practicing both depth and dynamic disciplines. Its key feature is weight modulation, allowing the ballast to be adjusted from 1 kg up to 4 kg in a single product, ensuring flexibility and precision when fine-tuning underwater trim.

Technical Features

• Made of lead coated with thermoplastic rubber, ensuring mechanical strength and protection against wear
• Highly hydrodynamic design to reduce drag in the water and promote a smooth swimming motion without overloading the neck
• Semi-mobile segments that follow the movements of the thoracic vertebrae, ensuring maximum freedom of movement without restrictions
• Weight distribution concentrated near the balance point of buoyancy forces, improving stability and balance during the dive
• Equipped with safety clips to prevent accidental loss of the segments

Functionality and Modularity

The system consists of a modular collar to which up to 5 semi-mobile rear segments with variable weights can be added, making it easy to move from a 1 kg setup up to 4 kg. The numbered plastic segments allow quick assembly and replacement, making it easier to adapt to different diving conditions.

Available Configurations

• 1.6 kg collar, suitable for depth freediving
• 3 kg collar with 4 rear segments
• 4 kg collar with 5 rear segments, ideal for dynamic freediving when more ballast is required

Additional Details

• Color: black
• Base weight: 1.6 kg
• Rear segments can be added or replaced by purchasing the 4-piece kit or individual 280 gram Dyno and 1 kg Dyno segments

The D&D collar is an ideal technical solution for freedivers and spearfishers who need a modular, comfortable ballast system to optimize trim in both static and dynamic dives, improving weight transfer and freedom of movement during finning.

D&D Modular Weight Neck Collar - Deep & Dynamic for freediving and spearfishing

The D&D Neck Collar by C4 represents an important evolution of the traditional Dyno neck collar, designed specifically for those practicing deep freediving and dynamic apnea. Its main feature is its adjustable weight, which can range from 1 kg up to 4 kg depending on the needs of the dive, providing a single product adaptable to different buoyancy setups.

Technical features and materials

Made from lead coated with thermoplastic rubber, the neck collar features a hydrodynamic shape designed to optimize finning fluidity and reduce load on the neck, improving comfort and freedom of movement during freediving.

The weight is positioned close to the body’s center of gravity, aligning with buoyancy forces to make balancing in the water easier. In addition, the semi-mobile rear segments are designed to follow the natural movement of the thoracic vertebrae without limiting the swimmer’s mobility.

Modularity and configurations

The system consists of a modular base neck collar to which removable, numbered rear segments made of plastic attach, allowing the weight to be adjusted quickly and safely, also thanks to safety clips that prevent accidental loss.

The available configurations are:

• 1.6 kg Neck Collar - ideal for deep dives, with reduced weight for greater agility
• 3 kg Neck Collar - version with 4 rear segments for a balanced and versatile buoyancy setup
• 4 kg Neck Collar - with 5 rear segments for dynamic apnea and increased ballast

Benefits during underwater use

• Precise weight adjustment to easily adapt to the type of freedive
• Reduced cervical stress thanks to the ergonomic shape and soft coating
• Maximum freedom of movement ensured by the semi-mobile segments that move with the spine
• Simple and secure assembly with numbered segments and anti-loss clips

The D&D Neck Collar is a targeted technical solution for freedivers and spearfishers who need a customizable weight system that improves efficiency, comfort, and buoyancy control in the water.

Lobster Neck Weight Base - Dark Blue

The Lobster neck weight base is designed to distribute weight optimally during dynamic freediving sessions, avoiding excessive load on the freediver’s neck during the dive. Its highly hydrodynamic structure improves swimming efficiency, allowing you to cover greater distances with less fatigue.

Design and functionality

• Ergonomic shape that distributes weight toward the balance point of buoyancy forces
• Allows you to bring your hands together above your head for a smoother, more effective swim
• Modular segments in different weights and sizes to adjust the load according to your needs

Components and materials

Additional weights (not included with the base) are attached using silicone inserts, providing a secure yet flexible connection. This system allows the segments to follow the movement of the vertebrae without restricting mobility, ensuring comfort and freedom of movement.

Technical features

• Base weight: three different sizes (1.5 kg - 2.5 kg - 4.0 kg)
• Color: Dark Blue
• Additional weight modules (segments) available separately
• Hydrodynamic design to reduce drag in the water while swimming

Benefits for freediving use

Lobster improves trim and helps maintain proper posture, increasing finning efficiency and reducing neck fatigue. The freedom of movement provided by the segmented system helps maintain smooth movement and comfort.

300-Gram Segment for Mares Neck Weight Collar

Specific 300-gram weight segment designed for the modular Neck Weight collar by Mares, ideal for fine-tuning ballast in spearfishing and freediving.

Made with a practical quick-release system, it allows efficient, fast adjustment of the collar weight directly during in-water activity.

The white color provides good visibility and makes the segment easy to identify during use.

Main Technical Features

• Durable, lightweight material for optimal longevity and comfort in the water
• Compatible with the Mares Neck Weight collar
• Quick-release system for immediate weight adjustment
• Unit weight: 300 grams
• Color: white

Operational Benefits

• Easy customization of the collar load to match freediving buoyancy needs
• Modular weight increase without compromising the spearfisher’s freedom of movement
• Ergonomic structure and functional design to improve practicality during dives

4.0 kg Lobster Neck Weight for Freediving

The Lobster Neck Weight is a ballast system specifically designed for freediving, consisting of a 2.5 kg base neck weight and 5 additional segments with variable weights (500 g, 400 g, 300 g, 200 g, and 100 g) that allow optimal ballast customization.

Hydrodynamic Design and Comfort

The shape of the neck weight is highly hydrodynamic, designed to distribute the weight close to the balance point of buoyancy forces, reducing load on the neck and improving freediving swimming efficiency. The semi-mobile segments, secured with rubber inserts, adapt to the movement of the thoracic vertebrae without limiting joint freedom, ensuring maximum comfort and smooth movement.

Modularity and Practicality

• The segments are easy to assemble and remove, allowing the weight to be adjusted according to the freediver’s different needs.
• The modular configuration allows precise ballast tuning while maintaining ergonomic and stable distribution during spearfishing.
• The insertion system with rubber parts ensures a secure hold without excessive rigidity.

Technical Specifications

• Maximum total weight: 4.0 kg
• Base neck weight: 2.5 kg
• Additional segments: 500 g, 400 g, 300 g, 200 g, 100 g
• Color: Green

D&D - Deep & Dynamic Weight Neck Weight for Freediving and Spearfishing

The D&D Neck Weight represents the technical evolution of the well-known Dyno neck weight produced by C4, designed specifically for deep and dynamic freediving. Its design allows the weight to be adjusted from 1 kg to 4 kg by adding or removing segments, providing the versatility needed for different types of dives.

Made of Lead Weight coated with a layer of thermoplastic rubber, the neck weight features a highly hydrodynamic shape that reduces load on the neck, allowing for a smoother, less tiring fin kick. Positioning the weight close to the hydrostatic balance point optimizes in-water trim, improving vertical stability and reducing mechanical resistance during movement.

The system consists of a modular neck weight with semi-mobile rear segments that follow the anatomy and movements of the thoracic spine, ensuring complete freedom of movement and minimizing any joint restriction during freediving sessions.

Technical Features

• Material: Lead Weight coated in thermoplastic rubber
• Hydrodynamic design for greater fluidity in the water
• Modular system with numbered plastic segments for fine-tuning the weight
• Semi-mobile rear segments to adapt to the movements of the thoracic vertebrae
• Safety clip to prevent accidental loss of the neck weight
• Adjustable weight from 1 kg (minimum configuration) up to 4 kg (maximum configuration)
• Base product dimensions and weight: 3.0 kg, white color

Available Configurations

• 1.6 kg neck weight – ideal for deep dives
• 3 kg neck weight – structure with 4 rear segments
• 4 kg neck weight – structure with 5 rear segments

The D&D - Deep & Dynamic Neck Weight is designed to meet the specific needs of spearfishing and freediving in both static and dynamic setups, optimizing the diver’s body balance and ensuring comfort and practicality even during extended dives.

D&D - Deep & Dynamic Neck Weight for Freediving and Spearfishing

The D&D neck weight represents the evolution of the Dyno neck weight from C4, specifically designed for deep freediving and dynamic apnea. The name Deep & Dynamic highlights its versatility: it allows the weight to be adjusted from 1 kg up to 4 kg in a single modular system optimized for spearfishing and deep freediving.

Technical Features

• Adjustable weight from 1 kg to 4 kg with removable, adjustable segments
• Material: lead coated in durable, hydrodynamic thermoplastic rubber
• Shape designed to minimize load on the neck and improve finning
• Semi-mobile rear segments follow the movement of the thoracic vertebrae, ensuring full joint freedom
• Equipped with a safety clip to prevent accidental loss during dives
• Color: black

Functionality and Benefits

The weight distribution is optimized to work close to the body’s center of gravity, balancing buoyancy forces and improving freediving efficiency. Thanks to the semi-mobile segments, the neck weight does not restrict the swimmer’s movements, maintaining fluidity and comfort during descent and ascent.

Available Configurations

• 1.6 kg: base configuration ideal for deep dives that require a light, balanced trim
• 3 kg: neck weight with four rear segments for medium buoyancy compensation in dynamic apnea
• 4 kg: neck weight with five rear segments for more demanding dynamic apnea sessions, with a higher ballast load

Included Equipment

• Numbered plastic segments to make assembly and weight adjustment easier
• Safety clip for fastening and prevention of accidental loss

The D&D neck weight provides a modular, functional system for quickly adjusting ballast balance in freediving, combining hydrodynamics, comfort, and freedom of movement, key aspects for spearfishing and freediving.

Lobster 4.0 kg Neck Weight for Freediving

The Lobster Neck Weight with 4.0 kg is an advanced weight system specifically designed for spearfishing and freediving. It consists of a 2.5 kg main neck weight and 5 additional segments with variable weights, designed to precisely fine-tune the load according to the diver’s needs.

Design and Hydrodynamics

The neck weight has a highly hydrodynamic shape, engineered to minimize drag in the water and avoid overloading the neck. The weight distribution is close to the balance point of buoyancy forces, significantly improving stability and efficiency during freediving swimming.

Modularity and Freedom of Movement

The additional segments, weighing 500 g, 400 g, 300 g, 200 g, and 100 g, are semi-mobile and lock into place via rubber inserts, allowing quick and easy assembly and disassembly. This solution makes it possible to adapt the total load to different conditions without limiting mobility, as the segments follow the movement of the thoracic vertebrae.

Technical Features

• Main neck weight: 2.5 kg
• Additional segments: 500 g, 400 g, 300 g, 200 g, 100 g
• Materials with technical details optimized for mechanical strength and comfort
• Attachment via rubber inserts for ease of use and stability
• Color: Ocean Blue LE

This system is ideal for spearfishers who need a modular weight positioned strategically to improve trim and fluidity of movement during the dive.

Adjustable Cordura Strap for Mares Freediving Neck Weight

The adjustable strap is made from Cordura, a material known for its mechanical strength and long-lasting durability, ideal for underwater applications such as the Mares freediving neck weight.

Its construction ensures a secure fit thanks to its adjustability, allowing it to perfectly adapt to individual needs during freediving and spearfishing sessions.

It features a quick-release system that allows immediate release in an emergency, improving safety and practicality in the water.

Weight Segment Kit for C4 Dyno and D&D Neck Weights

The Segment Kit consists of 4 additional weights for customizing the load on C4 neck weights, specifically designed for the Dyno and D&D models. The total kit weight is 1.4 kg, allowing buoyancy to be easily adjusted according to the needs of spearfishing and freediving.

Technical Features

• 500 g, 380 g, 280 g, and 210 g segments, for a total of 1.4 kg
• Fastening materials: pins and screws in stainless steel, ensuring corrosion resistance in marine environments
• Compatibility: suitable for Dyno and D&D C4 neck weights
• Color: White, for a discreet integration with freediving and spearfishing gear

Functions and Benefits

This kit allows precise weight adjustment on the neck weight, essential for achieving optimal trim during freediving descents. The ability to combine the individual segments provides accurate control over weight distribution, improving comfort and efficiency in underwater movement.

The stainless steel components ensure secure, long-lasting attachment even with frequent use in saltwater, while the modular design makes the segments easy to install and remove.

D&D - Deep & Dynamic Neck Weight for Freediving and Spearfishing

The D&D neck weight is a modular ballast system developed by the C4 brand, designed specifically for the needs of freediving and spearfishing, both for deep dives and dynamic apnea. The name Deep & Dynamic reflects the product’s versatility, allowing the weight to be adjusted from 1 kg up to 4 kg to suit different types of dives.

Technical Features and Materials

The structure is made of lead coated with thermoplastic rubber, a combination that ensures high mechanical strength and durability while maintaining excellent hydrodynamics. The shape of the neck weight is designed to prevent overload on the neck, improving streamlining and comfort during finning.

The ballast segments are semi-mobile and positioned close to the balance center of buoyancy forces, allowing a more natural, less fatiguing trim for the swimmer. Their ability to follow the movement of the thoracic vertebrae ensures complete joint freedom and no restriction of movement in the water.

Weight Modularity and Customization

The system consists of a modular neck weight supplied with additional rear segments of variable weight, easily removable and mountable to adjust the total ballast. This modularity allows the neck weight to be quickly adapted to different dive requirements without compromising comfort or fit.

It is supplied with numbered plastic segments to make it easier to replace the front weights with lightweight segments, creating different weight configurations. The integrated safety clip prevents accidental loss of the segments during use.

Available Configurations

• 1,6 kg – base version ideal for deep dives
• 3 kg – configuration with 4 rear segments for greater weight in dynamic apnea
• 4 kg – complete neck weight with 5 rear segments for maximum modular ballast

Additional Details

• Base neck weight: 1,6 kg
• Color: white
• Material: lead coated with thermoplastic rubber
• Rear segments available individually or in 4-piece kits
• Can be integrated with 280 gram or 1 kg Dyno segments

Weight Segment Kit for C4 Dyno and D&D Neck Weights

This 1.4 kg segment kit is designed to allow weight customization for C4 neck weights used in freediving and spearfishing, ensuring precise, adjustable buoyancy trim according to different underwater needs.

Kit Contents

• 4 separate weight segments: 500 g, 380 g, 280 g, and 210 g
• Compatible with Dyno and D&D C4 models
• Complete with stainless steel rods and screws for secure, corrosion-resistant fastening
• Black color for a discreet profile that integrates cleanly with your gear

Technical Features and Benefits

By allowing the weight segments to be combined, the kit makes it possible to precisely adjust the load on the neck weight, optimizing underwater trim. The use of materials such as stainless steel ensures mechanical strength and durability even in marine environments.

The screw-and-rod assembly provides stable, reliable fastening, preventing unwanted movement during freediving or spearfishing sessions.

Lobster 4.0 kg Neck Weight for Freediving

The Lobster Neck Weight weighing 4.0 kg is a modular weight system specifically designed for spearfishing and freediving. Consisting of a 2.5 kg main neck weight and five additional segments with variable weights, it ensures optimal load distribution.

Hydrodynamic Design and Comfort

The neck weight’s shape has been engineered to deliver high hydrodynamic efficiency, minimizing drag in the water without overloading the diver’s neck. Thanks to the semi-mobile segments that precisely follow the movement of the dorsal vertebrae, the neck weight ensures maximum freedom of movement with no restriction during finning.

Modularity and Weight Adjustment

The additional segments, weighing 500 g, 400 g, 300 g, 200 g, and 100 g, are easy to remove and assemble using interlocking rubber inserts. This solution makes it easy to customize the load to suit different buoyancy and trim requirements.

• Main neck weight: 2.5 kg
• Additional segments: 500 g, 400 g, 300 g, 200 g, 100 g
• Interlocking system with rubber inserts for easy assembly and disassembly

Technical Advantages

The position of the weight close to the buoyancy balance point allows for effective stabilization of underwater trim, minimizing fatigue and improving movement fluidity while diving. The close-fitting shape and overall lightness help maintain a high level of comfort throughout the entire freediving session.

Color: Very Pery.

Lobster Squid Weight 1.3 kg Freediving Weight Collar

Squid Weight is a modular weight collar designed specifically for spearfishing and deep-water freediving. Made up of an 800 g base and 10 additional 50 g segments, it allows you to easily adjust the total weight up to 1.3 kg to suit different underwater buoyancy requirements.

Its hydrodynamic shape significantly reduces drag in the water, preventing neck overload and improving finning fluidity and freediving swimming efficiency. The weight is distributed close to the balance point between buoyancy and gravity forces, optimizing body stability and trim during the dive.

The semi-mobile segments are mounted directly on the collar base and adapt to the movements of the spine, ensuring maximum freedom of movement and ergonomic comfort. This modular system makes it easy to add or remove weights to customize the load according to dive depth and duration.

Main Technical Features

• 800 g base collar with 10 weight segments of 50 g each
• Total weight adjustable up to 1.3 kg
• Hydrodynamic design to minimize drag in the water
• Semi-mobile segments that follow the movements of the dorsal spine
• Easy assembly and disassembly for weight customization
• Secure fastening with silicone strap
• Matte black color, resistant to marine elements

Package Contents

• 800 g Lobster Squid Weight collar
• 10 additional 50 g segments
• Silicone safety strap
• Carry Bag

The Squid Weight collar is a versatile, technical tool for freediving and spearfishing, offering the perfect balance between comfort, freedom of movement, and precise weight adjustment in deep underwater environments.