Description
Men's Xerotherm Baselayer Top by Fourth Element
Space-Age Thermal Performance for Cold-Water Drysuit Diving
When you are diving a drysuit in extreme cold, your thermal comfort depends entirely on the efficiency of your layer system. The Fourth Element Men's Xerotherm Baselayer Top represents the ultimate foundation for cold-water thermal management. Crafted from specialized Polartec® Powerstretch® fabric—a material originally engineered for NASA—the Xerotherm creates an insulating air layer directly against your skin. This unique knit structure delivers impressive thermal retention without adding the extra volume or unwanted buoyancy of traditional heavyweight fleece, giving you unrestricted mobility during complex valve shutdowns or long decompression stops.
Rapid Moisture Wicking & Professional-Grade Pedigree
Even the warmest drysuit undergarment will fail if it traps sweat against your body during high-exertion kicks or heavy surface swims. The Xerotherm is engineered for exceptionally fast moisture wicking, pulling perspiration away from your skin and pushing it toward your outer layers to prevent after-dive chills. Remarkable for its ability to maintain thermal insulation even when soaked, this baselayer is built for the world's most unforgiving environments. Proven in field tests from the Arctic Circle to the summit of Mount Everest, the Xerotherm is the go-to thermal layer for FBI Dive Teams, the Norwegian Navy, and professional public safety diving units worldwide.
Features
- NASA-Heritage Polartec® Fabric: Originally developed for space exploration, this specialized knit traps insulating air against your torso for maximum thermal efficiency.
- Rapid Moisture-Wicking Performance: Actively draws perspiration away from the skin to keep you dry and prevent rapid heat loss during surface intervals and decompression.
- Zero-Bulk Thermal Efficiency: Provides substantial warmth without adding thickness, preventing restriction around your arms and shoulders while minimizing weight and buoyancy.
- Insulates Even When Wet: Advanced synthetic fiber blend continues to retain body heat even if your suit experiences a minor seal leak or flood.
- Four-Way Stretch Comfort: Moves seamlessly with your body, eliminating binding or bunching under heavier drysuit undergarments.
- Elite Tactical Pedigree: Trusted and deployed by the FBI Dive Teams, the Norwegian Navy, and British Police Diving Units for extreme-environment operations.
- Hardwearing Construction: Resists pilling and abrasion from drysuit harnesses, zippers, and heavy outer thermal garments.
Specs
- Brand: Fourth Element
- Product: Men's Xerotherm Baselayer Top
- Material Composition: 57% Polyester, 33% Nylon, 10% Elastane
- Fabric Technology: Polartec® Powerstretch®
- Wicking Profile: High-velocity moisture wicking
- Primary Application: Drysuit thermal baselayer, cold-water technical scuba diving, and extreme-environment insulation
- Care Instructions: Machine washable; line dry only; do not tumble dry, bleach, iron, or dry clean
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Our promise is that you get the right gear, and that it's right the first time. As divers ourselves, we'll help you find the perfect fit for your style of diving. Then, we'll quality-inspect your order before it ships to ensure it's ready for your next adventure. We're your local dive shop, no matter where you are.