I bought it to use in the bed. When I lay down, I put it under my back because the mattress was so uncomfortable that I was sleeping on. That thing worked like a dream. I was so comfortable after that. Since then, I have put it in the car and it makes 100% difference when I drive more than five or 10 miles great great back pillow. I bought it to use in the bed. When I lay down, I put it under my back because the mattress was so uncomfortable that I was sleeping on. That thing worked like a dream. I was so comfortable after that. Since then, I have put it in the car and it makes 100% difference when I drive more than five or 10 miles great great back pillow.