Full circumferential shell with additional semi-soft toe bumper for frontal toe protection Soft Flex Edge™ reduces pressure points. Full rocker bottom is especially engineered to be low and wide to help promote a natural gait. Stretch-to-fit shell for optimal fit Shell can be trimmed for additional stretch in the calf. Cushioning and breathable soft good provides comfort Linked medial/lateral bladders for easy inflation and equal compression Integrated pump and air release valve for easy access Medium fits those who wear women’s shoes, size 8-1/2 to 12, or men’s shoes, size 7 – 10-1/2. Will work for left or right foot .