Fourth Element

Fourth Element Thermocline Shorts | Men’s

£95.00 A Eco-Rating

The Fourth Element Thermocline shorts are perfect for diving in warm water. Wear them under your suit and they won’t ride up like boardies do.

Anything that’s Ocean Positive gets a massive thumbs up from us at The Honest Diver. The Thermocline range goes even further as it performs brilliantly and comes in biodegradable packaging!

We love the Fourth Element Thermocline Shorts. They’re neutrally buoyant, neoprene free but still have the thermal properties of 2mm wetsuit!

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The Honest Truth


Team Diver

Use these Fourth Element Thermocline shorts to give an extra layer of warmth under your wetsuit. You can also pair them with a long sleeve top or hooded vest to make a more versatile shorty wetsuit.

Protecting The Ocean


The Fourth Element Thermocline shorts utilise a unique fabric made using ECONYL®

It’s 100% recycled nylon from ghost fishing nets and other discarded waste, then laminated with a waterproof membrane and thermal fleece.

The Thermocline range revolutionises the notion that being environmentally responsible means sacrificing performance or aesthetics.

The next generation Thermocline fabric is the highest performing fabric Fourth Element have ever made for this application and it feels as good as it looks.


Designed to be worn under a wetsuit or on their own in warmer waters, the Fourth Element Thermocline shorts help to increase thermal protection to the body core.

The shorts can also be worn with the short sleeved top to make a lightweight shortie wetsuit.

The shorts are a smart alternative to board/swim shorts as the close-fitting material won’t ride up under a wetsuit.

Worn under board shorts, the Fourth Element Thermocline shorts can provide that extra thermal protection allowing you to extend your season in the water with the freedom and comfort of shorts before moving to a full neoprene wetsuits.

A high back means it won’t ride down when paddling or swimming.



Thermoclines are the original neutrally buoyant wetsuit system. They’re lightweight, machine washable and equivalent to 2mm neoprene.

Because there’s no neoprene, Thermoclines are perfect for those with allergies. You can either replace the traditional wetsuit entirely or use them as a barrier, reducing contact between the skin and the wetsuit itself.*

The range is perfect for all surface water sports as well as warm water scuba. It’s lightweight, neutrally buoyant, machine washable, breathable and hypo-allergenic.

The fabric ensures that the wearer is more comfortable when out of the water, during surface sports, or when kitting up for a dive. The inner fleece layer draws moisture away from the skin and wicks through the breathable membrane where it evaporates off the nylon surface. In the water, the membrane traps a thin layer next to the skin and prevents colder water flowing over the body, perfect for surfers, freedivers and scuba divers.

Thermocline dries rapidly, often within an hour or between dives – a quick rinse and a squeeze to get rid of excess water before hanging it up inside out should ensure it is ready for your next adventure.

No more smelly neoprene suits – this wetsuit can be machine washed (we recommend using our SUB30 environmentally friendly washing liquid).

Store it safely with other garments and when packing for vacation there’s no need to worry about potentially damaging the fabric – it can be squeezed into that last remaining space in your luggage without any worries.

*In Fourth Element’s experience, skin allergies to neoprene, whilst rare, are also not caused by a single compound and therefore it is difficult to be certain of preventing a problem. Thermocline has been used with a great deal of success by neoprene allergy sufferers, but it is important to consult with a doctor about any symptoms and possible alternatives.


The Fourth Element Thermocline shorts are…

  • Neoprene free
  • Outer contains 78% recycled Nylon
  • Lightweight
  • Wind and waterproof fabric
  • Breathable
  • Neutrally buoyant
  • Machine washable
  • The equivalent of 2mm neoprene

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