I have a sleep number bed 5000 and every since I have had it, my back has ached in the morning when I get up. I have tried making it harder for support, but it makes my joints ache. Making it softer, sinks me into a pit. I finally purchased the 5.3 Cloud9 Queen 4 Inch 100% Visco Elastic Memory Foam Mattress Topper, and after a few nights adjusting to it, I do not wake up with a back ache or hip ache anymore. It does not get hot either. Of course, I have a mattress pad over it and I set my sleep number bed to be harder. It makes my bed higher, but that is fine. I love it and am so glad I tried it. I would not part with it now. When it first arrived, I took it out and let it expand for 48 hours. It did smell, but it was not an overcoming smell. Once it was fully inflated and 48 hours later, the smell was gone and there was no odor at all. If your bed is hard and your joints bother you when you try to sleep, I highly recommend you try this mattress topper. I love it.