●Product Material: High Density Nylon Cowhide, Sweat and Breathable ●soft and comfortable diving performance is strong. ●Waterproof material,316L stainless steel matt finish buckle ●Quality combination, back with waterproof calfskin lining leather fine waterproof moisture permeability. ●The clasp is made of steel and polished to be round. Ergonmically designed, strong,rust proof and wear-resistant.