Oofos OOriginal Sandal (Unisex) - BlackDiscover the story of OOFOS through the OOriginal Sandal! Its stylish design and ingenious OOfoam recovery technology set the stage for all future styles and models. OOfoam technology absorbs 37% more impact than traditional footwear Proprietary footbed design reduces stress on knees, ankles and other joints. Closed cell foam is machine washable and designed to minimize odor.