Fourth Element Xerotherm Undergarment Rubber The over pressure relief valve

The over pressure relief valve will prevent the marker from being over filled and can also be used to release air from the marker when you reach the surface

Double muzzle allowing for second rubber to be fitted

Extremely fast wicking

Alpha Dive Flag

Locking mechanism

Fourth Element Xerotherm Undergarment Rubber The over pressure relief valveDESCRIPTION Made using Polartec Powerstretch and originally developed for NASA the Fourth Element Xerotherm garment is the ultimate base layer for use with a drysuit. The Xerotherm range is designed to be worn combined with another undersuit or on it's own with a neoprene drysuit. Updated in 2018 with new women's and men's fits the Xerotherm garment traps a layer of air, which is a much better insulator that water, next to the skin keeping the wearer