Hyperflex Wetsuits Men's Polyolefin S/S Rash Guard Polyolefin Short sleeve, 1.5-millimeter Polyolefin thermo-layering shirt Layer under a full or hooded wetsuit for extra warmth Wear as a standalone with boardshorts as a chill blocker Flexible, close fit won't inhibit freedom of movement Polyolefin wicks away moisture, offers superior insulation, and is easy to care for with no odor retention