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Fourth Element

Fourth Element - Women’s Thermocline Long Sleeve Swimsuit - Front Zip

Fourth Element - Women’s Thermocline Long Sleeve Swimsuit - Front Zip

Regular price £150.00 GBP
Regular price £200.00 GBP Sale price £150.00 GBP
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  • Long front zip entry
  • Neoprene free
  • Hypo -allergenic
  • Lightweight
  • Breathable
  • Neutrally buoyant
  • Machine washable
  • Equivalent of 2mm neoprene
  • Outer contains 78% recycled Nylon


  • Due to the nature of the material it can feel tight when out of the water but it will loosen once in the water.

Materials & Aftercare

Fabric & Care:

  • Face: 78% Econyl® Regenerated Nylon / 22% Elastane
  • Back: 94% Polyester / 6% Elastane
  • Machine Wash at 30°C


These Fourth Element Swimsuits are part of their Ocean Positive range made using recycled nylon from ghost fishing nets and other discarded waste.  ‘Ghost nets’ amount to over 600,000 tonnes of lost gear every year. The main hazard is to marine life – from invertebrates to large marine mammals. They continue to fish, long after they have been abandoned, and account for countless lives. The netting, very slow to degrade, scrubs coral, creating a desolate seascape where they are dragged over the reef by shifting currents.

Now, all over the world, dive teams are removing these ghost nets from the wrecks and reefs, often at great depths, and bringing them up to the surface where they can be recycled and spun into nylon yarn.

Sizing advice - it can feel tight when you try it on, but when in the water the material will loosen.

When you are looking for a swimsuit with a little more warmth, this is the perfect solution.  Equivalent to 2mm of Neoprene, with a warm cosy fleece lining.  It gives you warmth, but without the restrictions of wearing a full wetsuit, perfect for cold water swimming. 

In this video Tam wears the older version of the thermocline long sleeve swimsuit.

Thermocline provides a solution for many people who suffer from neoprene allergies either by replacing the traditional wetsuit entirely or acting as a barrier when worn under a wetsuit, reducing contact between the skin and the wetsuit itself.*

Perfect for wild swimming, this revolutionary suit gives thermal protection. 


  • Lightweight
  • Neutrally buoyant
  • Machine washable
  • Breathable
  • Hypo-allergenic

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 body and prevents colder water flowing over the body, perfect for wild swimmers. 

Thermocline dries rapidly, 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 swim. 

No more smelly neoprene suits – this wetsuit can be machine washed.

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.

*It is Fourth Element's experience that 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.  

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