Features: -Washable polyester webbing upper -Non-marking rubber outsole -Hydrophobic mesh lining -Metatomical EVA footbed -Metatomical EVA footbed : This internal support mechanism is anatomically engineered to provide excellent arch support and cradle the natural contours of the foot -CNX : an entire line of footwear down to 10 oz. each, but kept the protection that made Keen famous. It’s addition by subtraction -All KEEN water sandals are machine washable. Use a small amount of detergent, wash on gentle cycle and air dry