The ultimate baselayer for drysuit diving. Made with Polartec® Power Stretch® fabric originally developed for NASA, the Xerotherm traps a layer of air next to the skin—providing significantly better insulation than water and keeping divers drier, warmer, and more comfortable during cold-water dives. The Xerotherm range is designed to be worn under another undersuit for added thermal protection or on its own beneath a neoprene drysuit, offering versatility for a wide range of diving conditions.
The advanced knit construction of the Xerotherm fabric delivers the fastest moisture-wicking performance in the Fourth Element product line. Moisture is drawn away from the skin through fine fibers and dispersed across the outer surface of the fabric, maintaining a thin, insulating layer of air next to the body. This moisture management is so effective that some divers report experiencing minor drysuit leaks during a dive without noticing until after surfacing.
“The performance is superb,” said world-renowned, award-winning underwater filmmaker Doug Allan after testing the Xerotherm in 29°F (-2°C) water inside the Arctic Circle while filming for the BBC’s The Blue Planet—highlighting its reliability in extreme cold-water environments.
The Xerotherm is trusted by FBI Dive Teams, the Norwegian Navy, and British Police Diving Units, making it a proven choice for professional and recreational divers seeking dependable thermal performance under a drysuit.
