Lace-lock bungee system with adjustable hook-and-loop strap Eco Anti-Odor for natural odor control Machine-washable for easy care Material Washable polyester webbing upper Non-marking rubber outsole leaves no trace Quick-dry lining for active use EVA insole with arch support for all-day comfort Care Our water sandals are machine washable. Use a small amount of detergent, wash on gentle cycle, and air dry.