An evolution of the OOriginal, featuring an agile OOfoam™ strap for additionalsupport and comfort. A slip-on, after-sport slide and more, made of our the breakthrough OOfoam. Holds tight and conforms to your foot to ensure incredible impact absorption, arch support and natural motion. Ideal for post-workout recovery with moisture resistance that make it great for the shower. Features and Benefits OOfoam: Absorbs 37% more shock than other materials Reduces stress on sore feet, knees and lower back Cradles your arches Biomechanically designed footbed allows natural motion Soft, conforming toe post eliminates toe chafing Shower/beach-ready; moisture resistant; doesn’t retain smell Durable OOfoam holds its cushion Machine washable So light they float Sizing: Size shows men's first then women's(ie. M7/W9 is a men's size 7 and a women's size 9)