Sharkskin Thermal Flex Long Sleeve (Men's)

The men's Sharkskin Thermal Flex Long Sleeve is a new 2026 thermal top for snorkelers and swimmers who want more warmth than a rash guard offers, without zipping into neoprene. It suits long snorkel sessions and cool morning boat rides. With UPF50+ coverage, it also keeps the sun off your arms on the surface.

How Thermal Flex Keeps You Warm

The top is cut from Hydrophobic Nanotech Compression fabric with Far Infrared (FIR) technology built in. Rather than relying on a thick layer, FIR helps hold your body heat close, so the top stays warm while remaining thin and flexible. The fabric also repels water and keeps absorption to a minimum, so it doesn't turn heavy and cold when you climb out.

• Warmth without the bulk or buoyancy of neoprene
• Water repellent fabric that limits absorption
• UPF50+ sun protection
• Full freedom of movement for swimming, surfing and paddling

Men's Fit and Sizing

Men's sizes run from SML to 5XL, and the top comes in Charcoal or a high visibility Orange that is easy to spot in the water. The compression fabric fits close to the body, so choose your usual size for a snug fit that won't flap in the water.

Frequently Asked Questions

Is the Thermal Flex Long Sleeve warmer than a rash guard?

Yes. It uses FIR technology and a compression fabric designed to keep you warmer than a standard rash guard while staying thin and flexible.

Does it add buoyancy like a wetsuit top?

No. Thermal Flex is designed to keep you warm without the extra bulk and buoyancy of neoprene.

What colors does the men's top come in?

The men's Thermal Flex Long Sleeve is available in Charcoal and Orange.