EUC Made with OOfoam™, a proprietary foam that provides 37% more impact absorption than traditional EVA shoe foams Soles and footbeds allow for the natural motion of your feet, reducing stress on sore feet, knees and back Minimalist construction leads to light weight Machine-washable foam is moisture and bacteria resistant OOFOS sandals are made in whole sizes; OOFOS recommends sizing down if you're a men's half size, or size up if you're a women's half size