Crosskix Tetra Stone Water Shoes are 100% water submersible; KPU upper made for use on any type of terrain, activity, or stress; Innovative water drainage without compromising athletic and lifestyle design; With the cork insert, never worry about water logged inserts ever again; Rubber non-slip outsole with an aggressive tread pattern, rubber non-marking and non-slip outsole; Dri-fit technology offers quick drying micro-mesh inner lining with ribbed throat making it comfortable enough to wear without socks