Rip Curl Men's Flashbomb Heatseeker 4/3mm Zipperless Steamer is the most technically advanced cold water wetsuit ever. Featuring heat-generating materials, super quick-drying and superior design provide the ultimate cold water wetsuit. It features Flex Energy neoprene that generates heat when stretched. As you move through the water, the Flex Energy lining will activate and heat your wetsuit. The Liquid Mesh is a superior stretch smooth mesh panels that absorb solar heat and reduce wind chill. Thermo Shield is more durable than smooth neoprene, it increases warmth by removing wind chill from the arms. E5 Flashlining throughout the entire suit that funnels water rapidly out of the wetsuit once it's hung and is one of the warmest and comfortable linings out there.