Learn how to choose your wetsuit thickness

Choosing the right surfboard wetsuit thickness starts with one non-negotiable factor: water temperature. This determines both your thermal comfort and your freedom of movement once you’re out back. To find the right suit for you, you need to consider the local conditions, your own sensitivity to the cold, and your surfing style.

This guide is designed to help you navigate the options and select the best thickness for your sessions.

How does a wetsuit work?

A wetsuit works on a simple principle: the neoprene allows a thin layer of water to enter between your skin and the suit. This water is quickly warmed by your body heat, creating an effective thermal barrier. The thicker the neoprene, the greater the insulation.

Beyond warmth, a suit also protects against board rashes, sun, wind, and minor impacts, while slightly improving buoyancy. Thanks to technological shifts, modern neoprenes are lighter and stretchier than ever—even in higher thicknesses. The result is a better blend of warmth, comfort, and flexibility, allowing you to choose the right thickness for the water temperature without losing “feel.”

Decoding thicknesses: 3/2, 4/3, 5/4/3

Torso, arms, legs: how thickness is distributed

Those mysterious numbers indicate the thickness of the neoprene in millimetres across different zones of your body.

• The first digit refers to the thickness at the torso—the vital area for maintaining your core body temperature.
• The second digit indicates the thickness for the arms and legs, where flexibility is the priority.

A 4/3 mm wetsuit, therefore, has 4 mm of neoprene on the torso and 3 mm on the limbs. Some models show three numbers, such as 5/4/3, where the last digit refers to zones needing maximum mobility: knees, elbows, and shoulders.

This clever distribution optimises the warmth-to-mobility ratio. Your torso, which moves less during paddling, can handle more thickness, while your arms and legs remain supple.

The influence of materials on performance

Thickness alone doesn’t tell the whole story. The quality of the neoprene, the type of seams, and the internal linings significantly influence thermal efficiency and durability. Modern neoprenes—whether limestone-based or derived from alternative technologies—offer better insulation at the same thickness compared to older models. Thermal linings multiply the insulating effect without adding bulk.

Thickness according to water temperature

2/2 mm and Shorties: for warm waters (20°C and above)

In tropical and subtropical waters, your priorities are sun protection and freedom of movement. A 2/2 mm suit or a shorty (short-sleeved/short-legged) is more than enough to keep you comfortable.

The shorty covers the torso while leaving the limbs free—ideal when the air is chilly but the water remains warm. This setup is perfect for dawn patrols or late-day sessions when the wind picks up. These minimal thicknesses preserve the feeling of direct contact with the water, which many surfers prefer. Maximum flexibility makes technical manoeuvres easier and extends your stamina.

3/2 mm: for temperate waters (16°C to 20°C)

The 3/2 mm suit is the “universal” choice for temperate waters. It offers a remarkable balance between thermal protection and mobility and is suited to most European and Mediterranean conditions.

Its main advantage is seasonal versatility. It will take you from spring through to autumn, adapting to temperature shifts thanks to its sheer flexibility. On warm days it prevents overheating, while on crisp mornings it maintains your comfort. This is the ideal thickness for surfers looking for a single suit to cover the majority of their annual sessions.

4/3 mm: for cooler waters (12°C to 16°C)

When autumn sets in and temperatures drop, the 4/3 mm wetsuit becomes your essential ally. This thickness marks the entry into “serious” suits for cool to cold water.

The extra thickness at the core effectively maintains your central body temperature, while the 3 mm limbs preserve your paddling ability. This configuration allows you to extend your sessions even as conditions get tougher. Modern tech makes these suits surprisingly supple despite their thickness.

5/4/3 mm and above: for icy waters (under 12°C)

Winter waters demand maximum protection. 5/4/3 mm, 6/5/4 mm, or even thicker suits become indispensable for maintaining your core temperature in extreme conditions.

These models usually feature an integrated hood—a crucial element as a significant amount of body heat escapes through the head. Some versions even offer “zipless” entry systems to maximise the watertight seal. Despite their impressive thickness, high-end suits retain acceptable flexibility thanks to ultra-stretch neoprene technologies.

Other selection criteria

Seams

Seam quality plays a key role in warmth, comfort, and the lifespan of your suit.

• Flatlock seams are fine for summer but let more water in.
• GBS seams (Glued and Blind Stitched) offer much better insulation while remaining flexible.
• Liquid-taped or power-sealed seams represent the high end, almost completely eliminating leaks—perfect for cold water and long sessions.

Finally, seam placement matters as much as the tech: well-designed panels that follow the body's natural movements reduce tension zones and chafing.

Thermal lining

Internal linings create an extra layer of air against your skin, multiplying the insulating effect. Some linings incorporate heat-reflecting fibres that bounce your body heat back inward. This technology, inspired by space-age gear, considerably improves the thermal efficiency of thicker suits. The texture also affects how easy it is to slide into—smooth surfaces glide over damp skin, making changing much easier.

Cut and fit

A poorly fitted suit negates all the benefits of the right thickness. If it’s too loose, water will flush through freely, drastically reducing warmth. If it’s too tight, it will hinder your movement and cause premature fatigue. Modern anatomical cuts mimic the human body in a paddling position, with pre-formed patches at the knees and elbows to prevent uncomfortable bunching.

Hoods, gloves, and boots

When the water gets truly cold, the suit isn't enough.

• Hoods prevent heat loss through the head—a very cold-sensitive area.
• Gloves keep your hands functional, allowing you to grip your board without your fingers going stiff.
• Boots protect against both the cold and sharp rocks or reefs. Their non-slip soles provide essential grip during the take-off.

Tips for choosing your ideal wetsuit

Evaluate the real water temperature

The "felt" temperature in the water doesn't always match the weather forecast. Before heading out, check data specific to your spot: specialist sites, webcams, or buoy data. Remember that water warms up and cools down slowly; it can be chilly in spring despite the sun, and remains mild in early autumn.

Consider your cold sensitivity and activity level

We don't all react to the cold the same way. A beginner, who often spends more time sitting and waiting between waves, will cool down faster than an experienced surfer who is constantly moving. If you are prone to feeling the chill, always lean towards the thicker option.

Test and adjust: the importance of sizing

Nothing beats a fitting. Put the suit on completely and move as you would at the lineup: paddle movements, squats, shoulder rotations. If it feels restrictive in the shop, it will be worse in the water. Pay close attention to the shoulders, armpits, and crotch—areas prone to chafing. It’s normal for a suit to feel a bit snug at first as neoprene stretches slightly with use, but a truly ill-fitting suit will never become perfect.

FAQ - Your wetsuit thickness questions