I read many reviews of the memory foam toppers and found the fact that they hold heat was a problem. I found these gel ones and thought I would give it a try. I have been using it for a month or so now and find it doesn't make my sleep any warmer or that I sweat. It felt great at first and I was sleeping very well, but now that I am used to it I sleep only slightly better than before. Considering that I slept pretty well before means that I sleep great now though. It was affordable and better than replacing the whole mattress, since I had a pretty good mattress to start with. I didn't want any sag either like some of those memory foam mattresses seem to do after a while. I figured too that if I needed a thicker topper it would be cheaper to get two two inch toppers than one four inch one. So perhaps I will purchase another one if I find it necessary in the future. Overall a happy customer here.