Details An evolution of the OOriginal, featuring an agile OOfoam™ strap for additional support and comfort.  Sport Flex:   A contemporary spin on the classic slide, with a sleek adjustable upper strap for a more optimal all-around fit. Features & Benefits Impact-absorbing OOfoam™ technology in OOFOS’ advanced footbed geometry. Rounded, cupped heel designed to enhance impact-absorption and stability with every step. Lightweight, flexible & packable for ultimate travel ability. Machine Washable. Air Dry.