Upgrade your shoes with Superfeet All-Purpose Cushion Insoles . An excellent introduction to doctor-recommended Superfeet shape, the special flex design hugs your feet and cradles your heels to help your footwear, and you, feel great. Durable 4mm thick Aerospring™ comfort foam delivers heel-to-toe comfort, while the flexible heel cradle provides structure and stability, reducing stress on feet, ankles and knees. Superfeet All-Purpose Cushion Insoles fit best in athletic footwear. Trim to fit your shoe size. Superfeet All-Purpose Cushion Insole Features: Dynamic superfeet shape Durable construction Ventilated forefoot Moisturewick Flexible heel cradle Aerospring comfort foam