The Original Recovery Footwear. Finding Your Size - Wear a half size? In general, we recommend that women who wear a ½ size size UP, and men who wear a ½ size size Down OOriginal - The one that started it all. The OOriginal recovery sandal established the proven foundation of proprietary OOfoam technology + patented footbed design that remains our top-seller OOfoam Technology - Our revolutionary OOfoam technology absorbs 37% more impact than traditional footwear foam materials to reduce the stress on your feet, joints & back. Plus, the closed-cell foam is machine washable and designed to minimize odor Patented Footbed - Our patented footbed cradles and supports arches to reduce energy exertion in the ankles by up to 47% compared to competitors’ footwear. So walking is easier. Recovery is faster. And yOO feel better Backed by Science - Research shows OOFOS reduce load, decrease compressive forces, and support foot mobility when compared to traditional footwear. As a result, every OOFOS Style carries the American Podiatric Medical Association Seal of Acceptance! Reasonable offers accepted. Bundle up for extra discount and save on shipping