The Aetrex Cobra Orthotic System is Built-In to every pair: Arch support helps to stabilize and align feet Arch support helps to relieve common foot pain & plantar fasciitis Support pod to help relieve forefoot pressure UltraSky EVA Foam to cushion and provide superior comfort Contoured rearfoot to cradle your heel and relieve pressure Details:Material: Light-weight UltraSky EVA Foam for comfort & durabilitySoft toe post for extra comfortExtreme cushioning and shock absorption to help prevent injury and provide unmatched supportDual density outsole provides pressure relief and shock absorption in the ball of foot and heel areas Water-friendly construction, so light they float! Removable Insole: None Heel Height: 1.125"