The OOFOS story begins with the OOriginal Sandal. This combination of sleek design and revolutionary OOfoam recovery technology lays the groundwork for all future styles and models.Made with OOfoam, a proprietary foam that provides 37% more impact absorption than traditional EVA shoe foamsSoles and footbeds allow for the natural motion of your feet, reducing stress on sore feet, knees and backMachine-washable foam is moisture and bacteria resistantSku: 1000WATERDROP