Waterproof CR neoprene upper overshoe, while Smooth Skin Neoprene knuckles are made from diving neoprene. This gives Northwave maximum fit and effective waterproof protection. The waterproof and windproof neoprene toe area keeps your feet warm and cosy. Ultrasonically welded seams in the entry area and flat seams in the back keep the water out. The overshoe has a loop at the back to help you get in and is 17cm high.