The Fourth Element Xerotherm Socks are the ultimate baselayer socks for use under drysuit boots. Made using Polartec Powerstretch originally developed for NASA, the Xerotherm traps a layer of air – a much better insulator than water next to the skin, keeping the wearer drier and more comfortable.

The knit of the Xerotherm fabric produces the fastest wicking effect of any of the products in the Fourth Element range. Moisture is drawn through the fabric along fine fibres and then spreads over the outer surface. This maintains a thin layer of air next to the skin. This is so effective in the Xerotherm that some wearers report experiencing minor suit leaks during the dive without even noticing until after the dive. The range is designed to be worn under another undersuit or on its own under a neoprene drysuit.

The Fourth Element Xerotherm Socks have excellent thermal protection and comfort. They are thin enough to be worn under other drysuit socks yet capable enough as thermal protection in their own right, and they are comfortable thanks to the flat-locked seams and fast-wicking fabric.

Xerotherm Socks features

• Lightweight warmth
• Low bulk
• Single layer high wicking fleece fabric
• Flat locked stitching for comfort
• Can be layered under another pair of socks

“The performance is superb”. This was the reaction of Doug Allan, world-renowned and award-winning underwater filmmaker and author, after testing the Xerotherm in -2 degree (29F) water inside the Arctic Circle in Svalbard, whilst shooting sequences for the BBC production The Blue Planet.