I have a decent queen mattress but it isn't supportive enough for my bad back. I purchased the magic foam because I was told that it would help in supporting my back and would be very comfortable. It is definitely a great help. I have not had any back pain since I started using it. I have had a wonderful comfortable sleep every night and I've been using it now for over one month. I would definitely recommend this memory foam mattress pad to anyone who has a problem back .