The ultimate drysuit baselayer for Southern California cold-water diving. Designed for divers in California’s cooler Pacific conditions, the Xerotherm is a high-performance thermal baselayer built to keep you warm, dry, and comfortable on long dives in SoCal waters. Made with Polartec® Power Stretch® fabric originally developed for NASA, the Xerotherm traps a thin layer of air next to the skin—far more effective insulation than water—making it ideal for drysuit diving off the Southern California coast.
Engineered to be worn under a drysuit or layered beneath another undersuit, the Xerotherm works equally well on its own beneath a neoprene drysuit, making it a versatile choice for California wreck diving, kelp forest dives, and winter boat dives.
The advanced knit construction delivers the fastest moisture-wicking performance in the Fourth Element lineup. Sweat and moisture are pulled away from the skin along fine fibers and dispersed across the outer surface of the fabric, maintaining a warm, dry microclimate. This wicking efficiency is so effective that divers often don’t even notice minor drysuit leaks until after the dive—an essential feature for extended 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—a testament to its reliability even in extreme conditions.
Trusted by FBI Dive Teams, the Norwegian Navy, and British Police Diving Units, the Xerotherm is a proven choice for serious divers who demand warmth, durability, and comfort—whether you’re diving Catalina, the Channel Islands, or local Southern California shores.
