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. OOfoam™ technology absorbs 37% more impact than traditional footwear. Patented footbed design reduces stress on knees, ankles and other joints. Closed-cell foam is machine washable and designed to minimize odor.