An excellent introduction to doctor-recommended Superfeet shape, Superfeet All-Purpose Cushion insoles utilize a flexible design that hugs your arches and cradles your heels to help your footwear, and you, feel great. Durable Aerospring comfort foam delivers heel-to-toe comfort, while the flexible heel cradle provides structure and stability, reducing stress on feet, ankles and knees. Designed to replace the removable liner in athletic footwear. Trim to fit your shoe size.