Elastic cording gives this lightweight performance sandal a secure fit, easy to adjust in or out of the water. The washable upper makes cleaning easy, and the cushioned footbed provides comfort on the go. Metatomical FootbeedThe foot is made up of 33 joints, 107 ligaments, 19 muscles and tendons, and 26 bones, the largest being the metatarsals. KEEN ́s anatomically engineered footbed provides arch suppport that cradles the natural contours and make-up of the foot. Metatarsals + Anatomical Design = KEEN Metatomical Footbed. Keeps feet supported and comfortable. Cleansport NXTMicrobes lay dormant and invisible in the material of the product. When they come in contact with sweat, they are activated and reduce the odor.