NeoSport Wetsuits Premium Neoprene 7mm Hi Top Zipper Boot neoprene Comfortable, Durable and a Superior value. Uppers constructed from Soft and comfortable premium 5mm neoprene material. All seams on upper are glued and sewn for durability and warmth using durable bonded thread. Sole is constructed from soft and flexible thermoplastic rubber. Soft and flexible Heavy duty tractions sole with an internal puncture resistant liner. #10 YKK zipper with "Water Entry Barrier" that limits water exchange and helps keep feet warmer longer. Easy to put on and take off. Large sizes available up to men's 16 US. Wetsuit boots are designed to keep your feet warm, not dry, when they are used, on, under or around water.