The Roll and Go Seat Cushion, model WG-RG-001, is a gel seat cushion designed for use by individuals who sit for long periods in a wheelchair, including individuals with burns, pressure sores, lower extremity or mobility disabilities, or spinal cord injury. The unit is made of supportive and pressure relieving WonderGel, which consists of hollow columns of a gel called Gelastic, a solid rubber-like material. The columns form a pattern similar to a honeycomb, which redistributes and equalizes pressure between bony points and the broader, more fleshy parts of the body. This cushion rolls for transport. A cover is not included. OPTIONS: WonderGel replacement seat cushion cover. DIMENSIONS (HxLxW): 1 x 15 x 13 inches.