I have a good mattress. It has a pillow top and makes for a good night's sleep. However, it is now at least 4 years old and I was finding myself waking up with shoulder and back pain. This topper made all the difference! No more shoulder and back pain in the morning no matter how many hours of sleep I can get. Also, I haven't found myself getting hot at night, so I have to assume that's because the gel works. I'm very pleased with this product and recommend it to you if you're a side or stomach sleeper because it takes the pressure off.