Combining smooth-skin 1mm X-Foam neoprene in the torso area with high-stretch nylon material on the sides, sleeves, and collar, the men's Hybrid thermal long-sleeve top has a form-fitting design for a sleek hydrodynamic look and feel. Ideal for divers, snorkelers, paddle boarders, swimmers, and other water enthusiasts, this versatile 1mm diving top can be worn by itself or as a thermal under-layer beneath a traditional wetsuit. Underside of the nylon panels feature a micro-plush fleece fabric interior for enhanced comfort, which also absorbs less water and increases overall warmth by keeping heat against the body. Super-comfortable and stretchy, SCUBAPRO's X-Foam neoprene formula is petroleum free and complies with strict P.A.H. (Polycyclic Aromatic Hydrocarbons) test requirements. Also available in cargo shorts and a sleeveless hooded vest, this Hybrid Thermal top is backed by a manufacturer's limited 1-year warranty.