This is a very comfortable Memory Foam Coccyx wedge pad, that has made a huge difference to me when sitting on it, compared to the plain, hard upholstery cushion. The pad included a strap to hold it in place, which was easy to attach to the seat. I suffer from chronic back pain, and my pain has been significantly reduced, to where I can handle sitting for a half hour now without the pain I used to feel within 5 minutes. I would highly recommend this wedge pad to others.