I waited for about two months to write this review. I love this mattress topper! It does have big bumps that allows the heat to escape. I love the feel of it and you don't "sink" into the foam. Hate to feel as if I am "trapped" when trying to turn over as with some foam toppers. I do have it under my thick mattress pad that probably does help so heat does not build up as with most foam. My only con would be that they make all toppers two inches short in the width and length. I know this is for ease of fitting sheets but I would like them to be bigger. ALL toppers have this problem so it is not a fault of the Slumber Solutions. Some people complained of the smell. I took this out of the box, it expanded immediately, and left it out for two days. No smell after about the first day, but I wasn't ready to put it on the bed yet. Can't say enough positive about this item. Overstock.com is amazing! Shipping was super fast and very affordable. I have used them in the past and I am very pleased with their service!