The Reef Deluxe Diving Boot is made from 5mm Double Nylon II Neoprene with a inside YKK leg zipper with V-Cuff and Velcro zip tab. The sole is made from HD Rubber for extra wear and grip. The reef Dive boot also has added protection of a rubber Toe Cap, Heal and reinforced Fin Tab. The contour cut ensures better comfort and less strain on your foot muscles while diving.