@america, Rita, I bought a very expensive foam topped mattress seven years ago and lasted only 30 days on it. I was awakened constantly from being hot and sweating. I felt like a roasting chicken every night. I got rid of that mattress and that roasting ceased. The foam is a synthetic material and holds body heat. It does not breathe. Prior to that, we had a 3" thick memory foam slab on our bed. We got rid of it because we would sink down into it and it was like being encased in cement. I found that my legs were stuck down in a trench and it was difficult to roll over. I felt like I had to climb out of the groove. There may be brands out there that are good and do not roast you, but I don't know which ones they would be.