SCUBAPRO's HYBRID THERMAL LONG SLEEVE TOP features smooth-skin 1mm neoprene in the torso area and high-stretch nylon material on the sides, sleeves and collar. On the underside of the nylon panels a microplush interior makes the top warm and cozy. This fleece fabric absorbs less water, which keeps heat against the body, increasing overall warmth. It also dries quickly.This stylish warmer can be worn by itself or as a thermal under-layer beneath a traditional wetsuit. It can also act as a barrier to the sun's rays when snorkeling or swimming.