This is the Akona Skin Suit Lycra Font Zip UV Protective Dive Suit Features: Cold Water Features: 2nd layer of thermal protection under your wetsuit Assists in donning your 3, 5, or 7mm suit. No more neoprene sticking to your skin. Help your customers get their suits on easier and faster. Warm Water Features: UV protection (SPF50) Defend against sea lice, jellies, and other irritants Form Fitting to reduce drag A wetsuit works when a thin layer of water is trapped between the wetsuit and the skin. The body temperature of the diver heats this water creating a nice insulation from the colder surrounding water. A properly fitting wetsuit directly relates to the effectiveness of the insulation. Your wetsuit should fit snug and still allow a full range of motion.