Fourth Element Men's Thermocline Short Sleeve TopThis top can be worn on its own as a thermal top or with a pair of Thermocline shorts as a lightweight shortie. Alternatively, layer this underneath a neoprene wetsuit to increase thermal protection of the body core by the equivalent of an extra 2mm of neoprene, without affecting your buoyancy. Features: Neoprene free Outer contains 78% recycled Nylon Lightweight Wind and waterproof fabric Breathable Neutrally buoyant Machine washable Equivalent of