Sharkskin Thermal Flex Swim Jammer (Men's)

The men's Sharkskin Thermal Flex Swim Jammer is a knee length swim short that gives you real warmth, something ordinary jammers do not. It suits ocean swims and snorkel sessions where your core and thighs start to cool, and surfers will feel the difference sitting on a board in the wind. New for 2026, it carries the full UPF50+ rating.

Built From Thermal Flex Fabric

Instead of neoprene, these jammers use Hydrophobic Nanotech Compression fabric with Far Infrared (FIR) technology built in. You get warmth without the thickness, and without the floaty feel that throws off your body position in the water. The fabric repels water and absorbs very little of it, which cuts drag so you can swim faster.

• Noticeably warmer than standard Lycra jammers
• No neoprene bulk or buoyancy
• Water repellent fabric that reduces drag
• UPF50+ sun protection

Men's Fit and Sizing

The men's jammer is available in SML up to 5XL. Like any compression jammer it is meant to fit firmly through the hips and thighs, so stay with your usual size rather than sizing up. It pairs with the Thermal Flex Long Sleeve if you want warmth on top too.

Frequently Asked Questions

How are Thermal Flex jammers different from regular swim jammers?

Regular jammers give no warmth. Thermal Flex jammers use FIR technology and a compression fabric to keep you warmer while staying thin and flexible.

Can I snorkel in the Thermal Flex Swim Jammer?

Yes. They are made for use in, on and under the water and add warmth without the buoyancy of neoprene.