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Squid Weight Weight Collar for Deep Water Freediving
Squid Weight by Lobster is a modular weight system with a total weight of 1.3 kg, designed specifically for freediving and deep-water spearfishing. The collar consists of an 800 g base and 10 additional 50 g segments, providing precise adjustment adaptable to different underwater trim requirements.
Technical Features
- Hydrodynamic shape designed to minimize drag while swimming and to avoid placing strain on the spearfisher’s neck.
- The semi-mobile segments follow the movement of the dorsal vertebrae, ensuring maximum freedom of movement and comfort during the dive.
- The weight is positioned close to the balance point of buoyancy forces, optimizing trim and finning efficiency.
- Simple, quick assembly of the segments onto the collar base, allowing immediate weight customization according to the specific needs of the session.
- Composed of 1 x 800 g base and 10 additional 50 g segments.
- Supplied with a silicone safety strap for stable and secure fastening during the dive.
- Includes a carry bag for practical, organized equipment management.
- Color: Matte Red.
Benefits for Freediving Use
The design of the Squid Weight collar significantly improves underwater posture thanks to the optimal positioning of the weight. The modular weight distribution makes it possible to quickly adjust trim without compromising freedom of movement and without overloading the neck—essential factors during extended freediving sessions or deep-water dives.
The combination of comfort, hydrodynamics, and practicality makes this system ideal for freedivers who require precise balance and an ergonomic weight that can follow the body’s natural movements during spearfishing or freediving.
Lobster Neck Weight Base - Green
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 the 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, ensuring a secure yet flexible connection. This system allows the segments to follow the movement of the vertebrae without limiting mobility, providing comfort and freedom of movement.
Technical features
- Base weight: three different sizes (1.5 kg - 2.5 kg - 4.0 kg)
- Color: Green
- Additional weight modules (segments) available separately
- Hydrodynamic design to reduce drag in the water while swimming
Benefits for freediving
Lobster improves trim and helps maintain proper posture, increasing finning efficiency and reducing neck fatigue. The freedom of movement provided by the segmented system allows you to maintain smooth movement and comfort.
500-Gram Segment for C4 Freediving Neck Weights
This 500-gram segment is designed for both C4 neck weights, Dyno and D&D, a technical device dedicated to freedivers. Made from durable materials and finished in gray, 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 adaptable to the individual needs of the freediver.
- Semi-mobile movement: After fastening, the segments maintain a certain degree of mobility, following the natural alignment of the vertebrae and ensuring no restrictions on spinal movement.
- Material and weight: The segment weighs 500 grams, offering a good balance between durability and lightness, ideal for avoiding added strain on posture during dives.
- Color: Gray, for a clean look and good integration with spearfishing equipment.
- Complete package: The product is supplied with an axle and screw for immediate fastening on C4 neck weights.
Functionality and Benefits
The segment’s modular, semi-moving design is intended to maintain freedom of movement in the spine during freediving dives, reducing possible discomfort or restriction. The structure allows optimal customization of the equipment, improving comfort and practicality in everyday use.
C4 Dyno Neck Weight 4.0 kg for Freediving
The Dyno Neck Weight 4.0 kg is a modular weight system designed specifically for spearfishing and freediving by C4. Its highly hydrodynamic design minimizes bulk and distributes weight ergonomically, helping avoid overloading the neck while swimming underwater.
Technical Features
- Hydrodynamic shape engineered to optimize force transmission and reduce water resistance.
- Semi-mobile segments that follow the natural movement of the thoracic vertebrae, ensuring full joint freedom and comfort during dives.
- Modular segments with variable weight, secured with screw pins for quick and easy assembly.
- Option to customize the load by adding 280 g Dyno segments, sold separately.
- Resistant and durable materials to ensure stability and reliability in saltwater.
- Available color: white.
Benefits for Freedivers and Spearfishers
Positioning the weight close to the body’s center of gravity helps effectively balance buoyancy forces, improving stability in the water and the fluidity of the fin kick. Thanks to improved weight distribution and modular adjustability, the Dyno Neck Weight helps maintain a natural posture, reducing fatigue and restrictions in neck and back movement.
Assembly and Customization
- Remove or add segments according to the desired weight.
- Secure each segment using the screw pin, ensuring a firm and stable hold.
- To increase weight, add the supplementary 280 g Dyno segments available separately.
- Adjust the neck weight so it fits comfortably around the neck without compression.
1 kg Segment for C4 Neck Weights – Freediving Equipment
The 1 kg segment is designed for both C4 neck weights, Dyno and D&D, a technical device dedicated to freedivers. This segment allows the neck weight to be customized modularly, ensuring precise adjustment to the freediver’s needs.
Technical Features
- Weight: 1 kilogram
- Material: durable and suitable for underwater use
- Color: Gray
- Attachment system: screw with pin included for safe, easy installation
- Modularity: multiple segments can be combined and assembled to adjust the overall weight
Functionality and Benefits
The screw attachment system ensures that 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 and stable trim in the water.
The system’s modularity allows the freediver to precisely customize weight distribution according to diving style and specific conditions, optimizing underwater efficiency and maneuverability.
280-Gram Segment for C4 Dyno Freediving Collar
This 280-gram segment is designed for both C4 collars, Dyno and D&D, 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 activity.
Technical Features
- Screw fastening: The system allows multiple segments to be combined, enabling a configuration that can be adapted to the individual needs of the freediver.
- Semi-mobile movement: Once fastened, the segments retain a degree of mobility, following the natural line of the vertebrae and ensuring no restriction in spinal movement.
- Material and weight: The segment weighs 280 grams, offering a good balance between durability and lightness, ideal for avoiding added strain on posture during the dive.
- Color: Gray, for a subtle look and good integration with spearfishing gear.
- Complete package: The product is supplied with pin and screw for immediate fastening on C4 collars.
Functionality and Benefits
The modular, semi-moving design of the segment is intended to maintain freedom of movement of the spine during freediving sessions, reducing possible discomfort or restriction. The structure allows optimal gear customization, improving comfort and practicality in everyday use.
380-Gram Segment for C4 Freediving Neck Weights
This 380-gram segment is designed for both C4 neck weights, Dyno and D&D, a technical device dedicated to freedivers. Made from durable materials and finished in gray, the segment integrates into the modular system to provide a customizable and functional solution during freediving activity.
Technical Features
- Screw fastening: The system allows multiple segments to be combined, enabling a configuration that can be adapted to the individual needs of the freediver.
- Semi-mobile movement: Once fastened, the segments retain a degree of mobility, following the natural alignment of the vertebrae and ensuring no limitations to spinal movement.
- Material and weight: The segment weighs 380 grams, offering a good balance between strength and lightness, ideal for not weighing down posture during the dive.
- Color: Gray, for a clean look and good integration with spearfishing equipment.
- Complete package: The product is supplied with axle and screw for immediate attachment to C4 neck weights.
Functionality and Benefits
The modular, semi-moving design of the segment is intended to preserve the freedom of movement of the spine during freediving, reducing possible discomfort or restriction. The structure allows optimal customization of the equipment, improving comfort and practicality in everyday use.
280-Gram Segment for Dyno C4 Neck Weight Specifically for Freediving
The segment is designed for the Dyno C4 neck weight, a device developed exclusively for the needs of spearfishing and freediving.
Made with a lightweight 280-gram structure, it ensures optimal load management without affecting underwater mobility.
Attachment System and Functionality
The segment uses a screw fastening system that allows multiple segments to be combined and assembled in a modular way, adapting them to the freediver’s anatomical profile and specific needs.
Once secured, the pieces remain semi-mobile, allowing excellent fluidity of vertebral movement without limiting the spine’s natural flexibility during the dive.
Technical Features
- Color: White
- Materials selected to ensure mechanical strength and durability in underwater environments
- Complete with pin and screw for fastening, for precise and secure assembly
1 KG Segment for C4 Dyno Freediving Neck Weight
The 1 kg segment is designed specifically for the C4 Dyno neck weight, an essential component for freedivers who need customization and comfort when balancing weight during freediving activities.
The screw fastening system allows multiple segments to be assembled and combined, adapting the overall weight to the individual needs of the freediver. This modularity enables precise, functional adjustment, ensuring optimal balance during the dive.
A distinctive feature of this segment is its semi-mobile behavior once secured. This flexibility allows the segments to move in sync with the spine, preventing restriction and preserving natural freedom of movement during finning and gun tracking.
Main Features
- Material: made to ensure mechanical strength and long-lasting durability
- Fastening system: screw and axle included for secure, stable assembly
- Color: white, with a version also available in black
- Compatibility: exclusively for the C4 Dyno neck weight designed for freediving
- Semi-mobile design to follow the movements of the spine without restriction
This segment is an ideal technical solution for freediving and spearfishing, where the ability to fine-tune weight and maintain optimal ergonomics is essential for safety and efficiency during the dive.
Lobster Neck Weight Base - Red
The Lobster neck weight base was designed to distribute weight optimally during dynamic apnea sessions, preventing excess 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 efficient 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 secured with silicone inserts, ensuring a safe 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 specifications
- Base weight: three different sizes (1.5 kg - 2.5 kg - 4.0 kg)
- Color: Red
- Additional weight modules (segments) available 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 segment system allows you to maintain fluid motion and comfort.
Squid Lobster Collar Insert for Freediving
This insert is specifically designed for the Squid Lobster collar, an accessory created for freediving and spearfishing. The modular solution allows the freediver to customize the collar’s overall weight, adapting it to their buoyancy requirements.
Technical Features
- Insert weight: 50 grams
- Color: Black Mat
- Snap-in fastening system for quick, practical installation or removal of the inserts
Operational Benefits
The snap-in mechanism ensures a stable hold, allowing inserts to be easily added or removed to precisely adjust the collar load. This modularity enables optimal balance during freediving dives, improving comfort and buoyancy control.
Applications
The inserts are designed for freedivers and spearfishers who require flexible weight management on the Squid Lobster collar, optimizing fit and comfort during dives.
Squid Lobster Neck Weight Insert - Freediving Accessory
The Squid Lobster neck weight insert is designed specifically for freediving and spearfishing, allowing precise adjustment of the neck weight based on individual needs.
The snap-in fastening system ensures optimal practicality, allowing the freediver to easily add or remove inserts, quickly and safely fine-tuning ballast during dives.
Technical Features
- Single insert weight: 50 grams
- Color: Red Mat
- Fastening method: snap-in system for quick weight adjustment
- Variable dimensions and weight to fit the Squid Lobster neck weight precisely
Thanks to these features, the insert ensures optimal weight distribution, contributing to better trim and greater efficiency of movement in the water.
800 g Squid Neck Weight Base for Freediving and Spearfishing
The 800-gram Squid Neck Weight Base is designed to minimize load on the neck during freediving, in line with the Lobester philosophy. Its highly hydrodynamic structure optimizes the swim stroke and allows you to reach greater depths with improved efficiency and safety.
The shape can be customized to fit different neck circumferences, ensuring a precise and stable fit during underwater activity. This distributes weight evenly, improving body position and reducing neck fatigue.
Technical Features
- Made with lightweight, durable materials optimized for underwater use.
- Ergonomic, hydrodynamic design to improve fluidity of movement in the water.
- Fastening via a silicone strap that fits into the dedicated holes, ensuring stability and comfort.
- Interlocking modular segments for adding extra weights and customizing ballast according to dive requirements.
- Suitable for any neck diameter, ensuring an adjustable and secure fit.
- Color: Red.
Benefits for Freedivers and Spearfishermen
The balanced weight distribution helps maintain a correct, stable posture during swimming, reducing neck fatigue and improving propulsion efficiency. The ability to bring the hands together above the head supports a hydrodynamic position that makes forward movement and control easier during descent and ascent.
800g Squid Neck Weight Base for Freediving and Spearfishing
The Squid neck weight base, weighing 800 g, is designed according to the Lobester philosophy to avoid overloading the freediver’s neck during dives. Its optimized geometry ensures balanced weight distribution, reducing neck stress and improving endurance and comfort during the finning phase.
The highly hydrodynamic shape allows the neck weight to adapt to the circumference of any neck, promoting balanced and efficient trim in the water. This helps make swimming smoother and allows greater depths to be reached safely and with control.
Technical features and functionality
- Durable, lightweight material with a black finish to maximize durability.
- Modular system with interlocking segments that allows additional weights to be added to customize the load according to the freediver’s needs.
- Silicone band included for stable fastening around the neck through the pre-drilled holes in the segments.
- Optimal weight distribution to maintain the body’s natural balance and improve control during spearfishing.
- Design that allows the hands to be joined above the head without interfering with posture, increasing movement efficiency during the dive.
The Squid neck weight base is an essential technical support for spearfishers who need a safe, adjustable accessory compatible with different loads, improving the smoothness and efficiency of the swim.
Lobster Neck Weight Base - Yellow
The Lobster neck weight base is designed to distribute weight optimally during dynamic freediving sessions, preventing 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 efficient 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 secured using silicone inserts, ensuring a secure yet flexible connection. This system allows the segments to follow the movement of the vertebrae without limiting mobility, providing comfort and freedom of movement.
Technical specifications
- Base weight: three different sizes (1.5 kg - 2.5 kg - 4.0 kg)
- Color: Yellow
- Additional weight module (segments) available separately
- Hydrodynamic design to reduce drag in the water while swimming
Benefits for freediving use
Lobster improves balance and helps maintain correct posture, increasing finning efficiency and reducing neck fatigue. The freedom of movement provided by the segmented system helps maintain smooth movement and comfort.
4.0 kg Lobster Neck Weight for Freediving
The Lobster Neck Weight at 4.0 kg is a modular ballast system designed specifically for freediving and spearfishing. It consists of a 2.5 kg base neck weight and 5 additional segments with varying weights (500 g, 400 g, 300 g, 200 g, and 100 g), allowing precise adjustment based on the diver’s needs.
Technical Features
- Highly hydrodynamic shape to reduce drag while swimming
- Weight concentrated close to the center of balance of buoyancy forces for optimal trim
- Semi-mobile segments mounted on rubber inserts that follow the movement of the thoracic vertebrae, ensuring maximum freedom and fluidity in neck movement
- Quick and easy assembly and removal of snap-in segments to customize the load in the water
- Color: high-visibility yellow
Benefits in Use
The specific design of the Lobster Neck Weight minimizes stress on the diver’s neck, improving comfort even during extended dives. The modular weight distribution promotes more precise trim control and a more efficient swim, helping reduce oxygen consumption. Thanks to the segments that adapt to back movement, there are no restrictions on thoracic mobility during propulsion phases.
Freediving Neck Weights and ballast weights
The neck weight is one of the most important technical tools in a freediver’s equipment. Positioned around the neck, it affects weight distribution in the upper body, where buoyancy is more pronounced due to residual air in the lungs and the volume of the neoprene wetsuit. Proper balance in this area helps maintain a more stable horizontal trim and reduces the muscular effort required to correct posture during glide and ascent phases.
This category includes the full range of complete neck weights ready for use, structural bases to be paired with variable-weight segments, inserts, and replacement straps. The products cover every level of use: from beginner freedivers approaching their first pool sessions to advanced freedivers working on precise trim in dynamic or static apnea.
Product types
Within the category, there are different types of ballast weights, each with distinct construction features.
Complete modular neck weights. These are the most popular solution among intermediate and advanced freedivers. They consist of a load-bearing structure—the base—and a variable number of additional weight segments that are interchangeable and removable. This system allows the total ballast to be calibrated by adding or removing individual weights without replacing the entire neck weight. The Lobster neck weights in the 2.5 kg and 4 kg versions, the C4 Deep & Dynamic neck weights in 1.6 kg, 3 kg, and 4 kg, and the C4 Dyno 4 kg neck weight fall into this category.
Fixed or semi-fixed neck weight. The Mares 2.4 kg neck weight is made of 300 gr segments connected to each other on a Cordura strap with a quick-release buckle. It allows the load to be adjusted directly in the pool, making it suitable for instructors who need to adjust student weights during sessions.
Cordura neck weights with compartments. The Best Divers freediving neck weight uses a Cordura fabric structure with fixed and expandable compartments, filled with nickel-plated lead shot that reduces oxide formation. Its elongated shape is designed to shift the weight’s center of gravity from the neck toward the rear of the chest, reducing pressure on the cervical area.
Neck weight bases and separate segments. Lobster bases for 2.5 kg and 4 kg neck weights, Lobster Squid 800 gr bases, and Lobster and C4 segments allow the components of the ballast system to be purchased or renewed separately. Lobster segments are available in different weights (100 gr, 200 gr, 300 gr, 400 gr, 500 gr) and multiple colors. C4 offers complete 1.4 kg segment kits as well as individual 280 gr and 1kg segments.
Complementary accessories. The category includes the Mares Cordura strap for securing the neck weight, Best Divers Cordura weight pouches (available in three weight variants), neck weight carry bags, and Lobster rubber inserts, used to secure and stabilize the weights inside Lobster neck weights.
Materials and technical features
The materials used in the products in this category reflect specific requirements for durability, comfort, and adaptability to the marine environment.
Lead Weight and nickel-plated lead shot. The internal core of the neck weights is made of lead, a high-density material that allows the product size to remain compact while maintaining the required weight. Best Divers uses nickel-plated lead shot which, thanks to the nickel coating, offers greater corrosion resistance than raw lead, reducing oxide formation over time.
Injection-molded thermorubber (C4 Dyno). The outer covering of the C4 Dyno neck weight is made of thermorubber using an injection-molding process. This production method allows for a thicker coating material compared to traditional processes, resulting in greater resistance to mechanical abrasion. The thermorubber surface keeps the neck weight in position on the wetsuit without slipping during movement.
Cordura. Cordura fabric is a high-tenacity technical nylon material, abrasion- and water-resistant, used for closure straps and weight pouches.
Screw assembly system (C4 Dyno). The C4 Dyno neck weight features a screw-based assembly and disassembly system that allows weight segments to be added or removed securely.
How to choose a neck weight
The choice of a neck ballast system depends on two main factors: discipline and wetsuit thickness.
Discipline practiced:
- In dynamic apnea in the pool, the neck weight is especially useful for correcting the tendency of the upper body to float, promoting a horizontal posture that reduces hydrodynamic drag.
- In static apnea, the neck weight helps maintain a relaxed position without the need to continuously contract the neck and shoulder muscles.
- In deep freediving at sea, use of the neck weight is more selective and is integrated with traditional belt weights.
Wetsuit worn. The thickness and volume of the neoprene wetsuit determine the amount of positive buoyancy to compensate for. A 5 mm or 7 mm wetsuit generates significant buoyancy in the chest area; a 1.5 mm or 3 mm wetsuit requires less neck ballast. The optimal weight should always be tested in the water before finalizing the configuration.
Fixed or modular system. Modular segment systems—such as Lobster and C4 neck weights—allow the ballast to be adjusted over time without purchasing a new neck weight. This makes them the most flexible choice for those who want to adapt the load to different wetsuits or different training phases. Fixed or semi-fixed systems such as the Mares Neck Weight are quicker to adjust and particularly suitable for pool use or training environments.
Total system weight. The range in this category covers everything from a few grams (50 gr or 100 gr inserts for micro-adjustments) up to 4 kg for complete neck weights. Most pool freedivers work with loads between 1 and 3 kg; those practicing freediving with thick wetsuits or in the sea may need heavier configurations.
Available brands
Lobster is the brand with the widest range in this category on Deep Blue. It offers complete neck weights in Lobster 4 kg and Lobster 2.5 kg versions in multiple colors, the 1.3 kg Squid neck weight in its complete version and an 800 gr base version, as well as an extensive range of interchangeable segments in five weights (100 gr, 200 gr, 300 gr, 400 gr, 500 gr) and rubber inserts. The availability of individual components makes the Lobster system easy to expand and customize over time.
C4 offers two complete neck weight lines: the Deep & Dynamic (D&D), available in three weight configurations (1.6 kg, 3 kg, and 4 kg) and in black and white colorways, and the 4 kg Dyno with an injection-molded thermorubber coating. It also offers individual segments and separate D&D segment kits to integrate neck weights already owned.
Mares is present with the 2.4 kg Neck Weight, a modular system with 300 gr segments on a Cordura strap with quick release, and with the Cordura strap as a separate accessory.
Best Divers offers its Cordura freediving neck weight with fixed and expandable compartments and nickel-plated lead shot, in the 1 kg base version (with 2 × 500 gr fixed weights) expandable up to 3 kg through additional pockets, and the Cordura weight pouch available in three weights.
Conclusion
Deep Blue’s freediving ballast weights category covers the full range of needs related to neck ballast in freediving: from entry-level systems such as Best Divers neck weights to advanced technical solutions from Lobster and C4, through to integration and replacement accessories. The availability of separate components—bases, segments, inserts, straps—allows you to build or progressively update your system without replacing the entire neck weight. The choice of the most suitable product depends on the discipline practiced, wetsuit thickness, and preferred configuration type, whether modular or quick-release.
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