The ultimate baselayer for drysuit diving in Southern California. Built for cold Pacific water temperatures, the Xerotherm is a high-performance thermal baselayer designed to keep divers warm, dry, and comfortable on extended dives along the Southern California coast. Constructed with Polartec® Power Stretch® fabric originally developed for NASA, the Xerotherm traps a thin layer of air next to the skin—providing far better insulation than water and improving overall thermal efficiency while drysuit diving.
Designed for versatility, the Xerotherm can be worn under another undersuit for added warmth or on its own beneath a neoprene drysuit, making it ideal for California kelp forest dives, wreck diving, and winter boat diving around Catalina Island and the Channel Islands.
The advanced knit structure delivers the fastest moisture-wicking performance in the Fourth Element lineup. Moisture is pulled away from the skin through fine fibers and dispersed across the fabric’s outer surface, maintaining a warm, dry layer of air next to the body. This wicking efficiency is so effective that some divers report not even noticing minor drysuit leaks until after the dive—an essential feature for long cold-water dives in Southern California.
“The performance is superb,” said world-renowned underwater filmmaker Doug Allan after testing the Xerotherm in 29°F (-2°C) Arctic water while filming The Blue Planet—demonstrating its reliability in extreme cold-water environments.
Trusted by FBI Dive Teams, the Norwegian Navy, and British Police Diving Units, the Xerotherm is a proven choice for serious divers seeking dependable thermal protection for drysuit diving in Southern California.
