Genuine Leather top for comfort and moisture absorption. Activated carbon filter bottom helps prevent foot odor. Conforming to the foot to provide proper weight distribution, Sure Comfort Half  Soles cushion the metatarsal area and prevents the pain and pressure often associated with wearing high heels. The unique leather surface gently holds and stops your foot from sliding forward into the toe area, providing a better fitting shoe. The superior cushioning will not flatten out, and the no-feel molded edge increases comfort for the ball of the foot. Transferable from shoe to shoe without tearing, and will fit all types and sizes of shoes.Also shapes to foot and will not shrink. One size fits all.