I purchased the 2 piece set for my office chair. I have problems with my back and sitting for a long time contributes to the pain. I looked at purchasing a new chair but decided to try the support pillow first as a cost effective method for taking care of my pain. It has worked really well. The only problem that I have had is the lumbar support doesn’t wont to sit where I want it to because it slides down on the back of my chair but that is due to the design of the back on the chair and not the support. I would highly recommend this product for someone who has problems position without pain. I haven’t used it in my car but I imagine it would be fabulous for a long drive. ..More