Cushzone Gel Seat Cushion for All-Day Sitting. Let's kush zone comfortable seat is good for relieving Back, Sciatica, Coccyx Tailbone pain while sitting. The cover is machine washable, It is lightweight, and has a cush zone which is good for the tailbone. It is used so I would recommend washing all used items before use. You can take the cover off and wash it It does have a zipper.