US design. Fishtail jersey made of easy-care elastic material, machine washable, with high resistance to bleaching, salt and chlorine. Open end allows water drainage and fast drying. Easy to put on and take off. Mono fin cover made of neoprene from the diving sport. The patented monofin is worn like a stocking, soft cuffs prevent pressure points - there are no straps. So the monofin fits every foot size.