Features:-Washable polyester webbing upper-Non-marking rubber outsole-Hydrophobic mesh lining-Metatomical EVA footbed-Washable polyester webbing upper-Non-marking rubber outsole-Hydrophobic mesh lining-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