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 comfortContoured rearfoot to craddle your heel and relieve pressure Details:Adjustability: Fully adjustable hook and loop closure for customized fitUpper Material: Synthetic LeatherMidsole Material: Light-weight UltraSKY™; EVA foam for comfort & durabilityExtreme cushioning and shock absorption to help prevent injury and provide unmatched supportWater-friendlyRemovable Insole: None Heel Height: 1.187"