Sharkskin Thermal Flex reinvents swimming and water sports! NEW FOR 2026 Take your water performance to the next level with Sharkskin Thermal Flex, the most advanced UPF50+ long-sleeve top engineered for swimmers, surfers, paddlers, and all watersports enthusiasts. Built with cutting-edge Hydrophobic Nanotech Compression fabric and incorporating Far Infrared (FIR) technology, this top is designed to keep you warm and comfortable without the extra bulk and buoyancy of neoprene and to repel water while minimizing absorption so you can swim faster. Whether you are pushing through the toughest swims, surfing or bodysurfing the waves at the beach, or paddling for hours, Thermal-Flex keeps you warmer without restriction so you can perform at your peak and stay comfortable longer in, on and under the water. Push Your Limits. Stay Warm. Go Faster. Reinvent Your Watersports Experience with Sharkskin Thermal Flex