The Aetrex 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 UltraSKY™; to cushion and provide superior comfort Contoured rearfoot to cradle your heel and relieve pressure Support pod to help relieve forefoot pressure Details: Adjustability: None Material: Lightweight UltraSKY™; for comfort Removable Insole: None Heel Height: 1.1" Metatarsal support to help reduce ball-of-foot discomfort Soft toe post for extra comfort Extreme cushioning and shock absorption to help prevent injury and provide unmatched support Water-friendly construction, so light they float