Fits almost every wheelchair, thanks to a unique mounting system. The angle of the ABS plastic shell construction, covered with a Vicair cushion, can be adjusted and provides extra stability to the wheelchair frame and both can be removed easily for transporting. The back cushion consists of nine separately adjustable compartments, each filled with Vicairs patented air-filled SmartCellsTM. A triangular thoracic support and a lateral support are also available. (Cushion shown without outer cover).