What a difference this makes to a still-good mattress that needed just a little more padding but nothing too soft, thin or hot. We’re getting older and have some additional aches and pains. This supports and cushions with some give where needed. So far, we have not overheated and have been getting restful sleep versus before using the topper. It is a good idea to unroll it for a few days to decompress and air out residual smell which only lasted for two days. It fits best with a deep pocket fitted sheet.  We like it so much, I think I’ll order another for my elderly parents.