The ultimate baselayer for drysuit diving. Made using Polartec® Powerstretch®—originally developed for NASA—the Xerotherm traps a layer of air next to the skin, providing exceptional warmth and comfort even when damp. Lightweight, low bulk, and incredibly efficient at wicking moisture, it performs superbly as a next-to-skin layer under a drysuit or on its own beneath neoprene.
Trusted by professionals worldwide—including the FBI Dive Teams, Norwegian Navy, and British Police Diving Units—the Xerotherm’s proven performance has earned it a reputation as one of the most reliable thermal base layers in diving. Flat seams, a long body cut, and thumb loops ensure the perfect fit and comfort throughout every dive.
A soft, low-profile waistband and flatlock seams maximize next-to-skin comfort. Lightweight, compact and fast-drying, J2 is the go-to first layer for expedition divers and anyone who values reliable performance under a drysuit.
Fabric & Care
- 57% Polyester / 33% Nylon / 10% Elastane
- Machine wash cold
- Line dry, do not tumble dry
Fit Guidance
Slim-fitting baselayer designed to sit next to the skin. Long body cut to prevent separation from leggings. Thumb loops keep sleeves in place when donning the drysuit.
Model: Alex wears size Large — Height: 6’2″ / Chest: 38″ / Waist: 31″
Related Underwater Gear Categories:
- Extensive Collection of Scuba Equipment
- Comprehensive Range of Fourth Element gear
- Wide Array of Rash Guards and Dive Skins
- Dive Travel Packages with Bluewater Dive Travel
Detailed Specifications
| Material | Polartec® Powerstretch® — 57% Polyester / 33% Nylon / 10% Elastane |
| Thermal Performance | Exceptional insulation; retains warmth even when damp |
| Moisture Management | High-wicking inner layer draws moisture away from skin |
| Fit | Slim fit, long body cut, flat seams, thumb loops to aid donning |
| Buoyancy | Low buoyancy for optimal trim and control |
| Care Instructions | Machine wash cold, line dry, do not tumble dry |
| Certifications / Users | Specified by FBI Dive Teams, Norwegian Navy, and British Police Diving Units |
| Weight | Approx. 0.6 kg / 1.3 lbs |
| Origin | Designed in the UK, manufactured in Europe |
- Fourth Element Xerotherm Long Sleeve Top – Men’s
- Reusable protective packaging
Men’s Size Guide
Body measurements. Ranges shown in cm with (inches) in brackets.
| Size | Height (cm/in) | Chest (cm/in) | Waist (cm/in) | Inside Leg (cm/in) |
|---|---|---|---|---|
| Small | 170–178 (67–70) | 86–96 (34–38.2) | 68–78 (27–30.5) | 79–83 (31–32.5) |
| Medium | 175.5–183 (69–72) | 96–106 (38–42.2) | 78–88 (30.5–34.5) | 82–86 (32.5–34) |
| Large | 180.5–188 (71–74) | 106–116 (41.5–46.2) | 88–98 (34.5–38.5) | 85–89 (33.5–35) |
| X-Large | 185.5–193 (73–76) | 116–126 (45.5–50.2) | 98–108 (38.5–42.5) | 88–92 (34.5–36) |
| XX-Large | 190.5–198 (75–78) | 126–136 (49.5–54.2) | 108–118 (42.5–46.5) | 91–95 (36–37.5) |
| XXX-Large | 195.5–203 (77–80) | 136–146 (53.5–58.2) | 118–128 (46.5–50.5) | 94–98 (37–38.5) |
Why Buy from Bluewater
1. Proof of Expertise
- Authorized Fourth Element dive gear dealer — full manufacturer warranty.
- Founded and staffed by active divers, underwater photographers, and explorers.
- Decades of combined hands-on experience with the gear we sell.
- We test and use most of the equipment ourselves before recommending it.
2. Risk-Free Purchase (See Terms Of Service)
- 30-day, hassle-free returns (unused condition).
- Secure payment with trusted gateways (credit card, PayPal, etc.).
- All products shipped in factory-sealed boxes (unless stated).
- Transparent policies — no hidden fees or fine-print surprises.
3. Fast & Reliable Delivery
- Free U.S. shipping over $200 for Photo Gear & $50 for Dive Gear.
- Same-day dispatch on in-stock orders placed before 12pm.
- Worldwide shipping options with reliable carriers.
- Real-time tracking updates sent straight to your inbox.
4. Extra Value at No Extra Cost
- Lifetime product support by email, phone, or in-store.
- Setup help & usage tips tailored to your needs.
- Exclusive buyer’s guides, tutorials, and dive trip invitations.
- Early access to special promotions & new releases.
5. Social Proof & Community
- Thousands of satisfied divers & underwater photographers worldwide.
- 5-star average product & service ratings.
- Active in dive events, conservation projects, and photography competitions.
6. Personal Connection
- Direct line to our in-house experts — no outsourced call centers.
- Friendly, passionate staff who speak “diver” fluently.
- We care about your whole adventure, not just the sale.
We offer lifetime support with all purchases.
Please call or email us with any questions; our knowledgeable staff would love to assist you.
