An evolution of the OOriginal, featuring an agile OOfoam™ strap for additional support and comfort. This combination of sleek design and revolutionary OOfoam™ recovery technology lays the groundwork for all future styles and models. Revolutionary OOfoam® technology absorbs 37% more impact than traditional footwear foam materials to reduce the stress on your feet and joints. Closed-cell foam is machine washable and designed to minimize odor.