The "Triple-C" Coccyx Comfort Cushion has specially shaped cut-outs allow a tender tailbone to "float in mid-air", while the rest of your back and bottom remain supported. Instructions: The Triple C seat part is firmer than the back part. You can sit on the foam ripple side up or flat side up. Specifications: Triple C cushions are sewn into a light nylon cover, complete with cloth carry handles and a removable strap on the back section. The product is easily portable, and fire resistant to British Standard 5852. It can be washed, but it needs to be dried out gently and slowly. (Tumble-drying will ruin the product).