Integrated Lumbar Support with Ergonomic Seat Frame System Injection Molded High Impact plastic Ergonomic Frame Heavy Duty 28 oz. Marine Grade Vinyl withstands the effects of sun, heat, rain and soiling under normal conditions High Compression Foam Padding for all day comfort and support Dimensions - Height: 22", Width: 18", Depth: 18.75", Seat Depth: 15.5"