In the 2000 teens I discovered this stress wedge and used it in my car seat. After gaining great benefit myself, I made the wedges available to my acupuncture patients with back and hip problems. With my own hip and back stiffness and pain recently from becoming active after much sitting the past year, I bought several of the wedges for around the house for use in various chairs. I also replaced the wedge in my car which had become quite "ratty." When visiting various health care practitioners and other places, I take the wedge from my car for when I have to do any sitting. The wedges make all the difference in gaining relief. Highly recommended.