KEEN Women's Whisper Sandal 100% polyester Made in the USA or Imported Rubber sole Bungee lace capture system Features elastic cording which gives this sandal a secure fit Hydrophobic mesh lining. Non-marking rubber outsole. Compression molded EVA midsole METATOMICAL FOOTBED DESIGN. This internal support mechanism is anatomically engineered to provide excellent arch support and cradle the natural contours of the foot. All KEEN water sandals are machine washable. Use a small amount of detergent, wash on gentle cycle and air dry.