Neoprene Accessories for Freediving

Neoprene Accessories for Freediving

The category of neoprene accessories for freediving brings together a selection of products designed to complement the wetsuit, improving thermal protection and comfort during sessions. These are not merely aesthetic add-ons, but technical elements that directly affect the ability to withstand cold, maintain focus, and extend time in the water.

Neoprene, thanks to its closed-cell structure that traps a layer of water between the material and the skin, is the reference material for thermal insulation in the underwater environment. The accessories in this category use this principle to protect the areas of the body most prone to heat loss: the head, torso, hips, and contact areas with cold surfaces such as boat or vehicle seats.

This section includes products from brands such as Mares, C4, Salvimar, and Omer, each with different construction features in terms of materials, thicknesses, and lining types.

Product Types

Neoprene undersuits

Neoprene undersuits are garments worn directly under a spearfishing wetsuit. Their main function is to add an extra insulating layer without requiring a thicker wetsuit, which would be stiffer and more restrictive in movement. This category includes models with a 2 mm thickness, available both as full versions and with an integrated hood.

From a construction standpoint, the models in the range differ by lining type: the Mares Undersuit uses neoprene with an external lining, while the C4 Ultrastretch undersuits feature a construction with smooth-skin neoprene on the outside and a stretch lining on the inside, reducing friction when putting it on and improving fit under the outer wetsuit. The C4 Ultrastretch with Hood variant has increased length in the hip area, a construction feature that increases thermal coverage in the lower back area.

Neoprene bermuda shorts

Neoprene bermuda shorts are accessories for thermal protection of the hip and thigh area. They are used together with the wetsuit during cold-water sessions or as an additional layer on extended outings. This category includes the Salvimar Bermuda Drop, offered in multiple color options.

Neoprene caps

Unlike an underwater hood, the neoprene winter cap — available in the C4 model — is an accessory for use out of the water, during boat transfers or on the surface on cold days. The neoprene construction provides greater thermal protection than common fabric headwear, resisting moisture and the marine environment without absorbing water.

Neoprene pee valves

The pee valve is a neoprene accessory inserted inside the wetsuit to facilitate urination without having to take off the gear. Salvimar offers the P-Channel Black model, built to be compatible with the main spearfishing wetsuits.

Neoprene seat protector

The neoprene seat protector — available in the C4 model in 3 mm double-lined nylon neoprene — allows you to travel by car while wearing your wetsuit, without wetting or dirtying the seat. The double-lined nylon material provides mechanical resistance and waterproofing toward the vehicle surface.

How to Choose Neoprene Accessories

Choosing neoprene accessories depends mainly on the water temperature where you practice spearfishing, the thickness of the main wetsuit already in use, and the body areas you want to protect with an additional layer.

• Water temperature: in waters below 18°C, using a 2 mm undersuit under a 5-7 mm wetsuit increases thermal protection without making the fit excessively stiff. In more temperate waters, a thin undersuit may be sufficient as the only additional layer.
• Lining type: models with an internal stretch lining, such as C4 Ultrastretch undersuits, are easier to put on and work well with wetsuits that have a smooth interior. Externally lined models pair better with wetsuits that have a smooth-skin neoprene exterior or a coated finish.
• With or without hood: if the main wetsuit does not include an integrated hood, the C4 Ultrastretch undersuit with hood also protects the head with a single garment, simplifying donning.
• Body area to protect: for the torso only, a basic undersuit is sufficient; for the head, you can choose a separate hood; for the hips and thighs, neoprene bermuda shorts cover an area not reached by a full undersuit.

Materials and Technical Features

The base material of all products in this category is Neoprene, a closed-cell synthetic elastomer that provides insulation, compression resistance, and buoyancy. The construction variants in the range differ by surface finish and lining type.

• External smooth-skin Neoprene (smooth skin): the smooth surface reduces friction with the water and, in undersuits, helps it slide under the outer wetsuit. C4 uses this finish on the outside of its Ultrastretch undersuits.
• Nylon-lined Neoprene: the nylon lining increases mechanical resistance, makes the garment easier to put on, and extends its durability. The C4 seat protector uses 3 mm double-lined nylon Neoprene to ensure waterproofing and abrasion resistance.
• Internal stretch lining: found in C4 Ultrastretch undersuits, it reduces friction between skin and Neoprene when putting it on, even when the skin is damp.
• 2 mm thickness: the common thickness in undersuits balances thermal protection and compressibility, making it compatible with wear under the main wetsuit without creating excessive stiffness.
• 3 mm thickness: used in the C4 seat protector, suitable for use out of the water where stiffness is not a critical factor.

Practical Use

The undersuit is worn before the main wetsuit. During periods with significant temperature swings—typically between September and November—it allows you to use the same wetsuit across a wider temperature range. With water temperatures between 16°C and 20°C, a 5 mm wetsuit paired with a 2 mm undersuit offers thermal protection equivalent to that of a thicker wetsuit, with greater freedom of movement. The version with an integrated hood simplifies donning and also provides head coverage with a single garment.

Neoprene bermuda shorts are used mainly during cold-water sessions, worn in addition to the wetsuit over the hips and thighs, or during particularly long outings where heat loss in the thigh area becomes a fatigue factor.

The neoprene hood is used when the head needs to be protected independently, without a full undersuit. It is one of the most commonly used accessories in fall and winter, when cranial heat loss becomes one of the main factors limiting the session.

The winter cap meets a comfort need out of the water: neoprene does not absorb water like traditional fabrics, maintaining its insulating properties even in damp conditions. It is useful during boat outings on cold or windy days, or during surface breaks between descents.

The pee valve is used during long sessions, when taking off the wetsuit is not practical. The Salvimar P-Channel model is built to integrate with the main wetsuits.

The seat protector is designed for car transfers from home or from the beach to the fishing spot, allowing you to keep your wetsuit on during the trip without wetting or dirtying the vehicle interior.

Available Brands

Mares is one of the benchmark brands in the spearfishing sector, with a well-established tradition in the production of neoprene gear. The 2 mm Mares undersuit with external lining is available in multiple sizes and is a widely used product in Italian spearfishing.

C4 offers Ultrastretch undersuits in this category — both the basic version and the version with integrated hood — made with smooth neoprene on the outside and stretch lining on the inside. The brand is also present with the winter cap and the 3 mm double-lined nylon neoprene seat protector. C4 is known for its focus on technical construction and the elasticity of its neoprene garments.

Salvimar contributes to the category with the neoprene Bermuda Drop, available in color variants, and with the P-Channel Black pee valve. Salvimar is an Italian brand with a broad product range in the spearfishing sector, present with functional accessories geared toward practical in-water use.

Conclusion

Neoprene accessories are often an underestimated component in a spearfisher’s equipment, but they have a real impact on the duration and comfort of in-water sessions. Managing body temperature is one of the key factors in freediving: adequate thermal protection allows you to extend time in the water on colder days and reduce physical fatigue caused by prolonged exposure to cold.

The available selection covers the main needs: from the technical ultrastretch neoprene undersuit for integration under any wetsuit, to the separate hood for head protection, from bermuda shorts for the hips to the cap for out-of-water use, through to practical accessories such as the pee valve and seat protector. The available brands — Mares, C4, Salvimar, and Omer — offer different constructions in material and finish, allowing you to select the most suitable product based on your wetsuit, conditions of use, and specific thermal requirements.