This topper is incredibly comfortable! I wake up in the morning with less stiff joints and lower back pain. I also feel like I get a more restful sleep and I wake feeling refreshed. I am a hot sleeper and do not feel any noticeable difference with this topper on the bed. I have the topper on top of the mattress but under the mattress pad. It stays in place and I have no problems with it moving around. We have a firm mattress and this helps keep the mattress from hurting my joints. Love it!