The Fourth Element 5mm Proteus II Men's Full Wetsuit is the highest performing wetsuit on the market. This 5mm is often the benchmark to which other suits are compared in terms of warmth. By combining the now famous Hydrolock inner neck seal and Glideskin wrist seals, water ingress is minimized. Seams are double glued, blind stitched and waterproof taped to provide outstanding thermal protection throughout the dive. Additional Hexcore linings on the body core torso provide enhanced thermal performance where it is most needed for prolonged water exposure. Thermoflex thermal lining throughout rest of suit.The 5mm suit is a versatile performer. Internal polyurethane (PU) ankle seals and ultra-stretch knee pads protect a high-wear area without restricting flexibility. With improved fit and thermal performance, the suit is easier to don then the classic Proteus, but its thermal performance is even better. Fourth Element recommends the 5mm suit for prolonged dives in temperatures of 66 Degree F (19 Degree C) and warmer. Suit has a back zipper entry with zipper tab leash for easy self-donning and doffing. The Proteus II is available in multiple sizes.