Fourth Element Xerotherm is the ultimate underwear layering system for drysuit diving. Constructed from specialized Polartec fabric originally developed for NASA, Xerotherm is the fastest wicking fabric in existence. This dramatically reduces conductive heat loss while diving.

Designed for versatility, Xerotherm underwear can be used on its own underneath neoprene drysuits or layered under Fourth Element Arctic or other drysuit underwear with trilaminate or other shell-type drysuits. Four-way stretch fabric ensures that Xerotherm provides outstanding thermal protection without loss of freedom or movement.

Almost 70% of your body heat is lost though your head. Fourth Element Xerotherm Hats stay warm even when wet, making them the ideal pre-dive and post-dive thermal protection. One size fits all.