Unisex OOFOS Ooahh Sport Flex Slide Size:M13 W15 Smooth Speed Assist is Mizuno's 197634749419 Smooth Speed Assist is Mizuno's signature performance geometry that encourages and supports efficient running form cool conditions Sleeker design than the original On Cloudrunner Enhanced stability with TPU heel clip for confidence inspiring runs Midsole Comfort driven design to support your everyday running goals Re imagined midsole geometry for smooth cushioning without compromise to support Helion Superfoam works in harmony with On Running’s signature CloudTec for shock absorbing comfort Unisex OOFOS Ooahh Sport Flex Slide An evolution of the OOriginal