[This review was collected as part of a promotion.] To start off, I will say I dont really know much about mattresses. The one I had, I had used for a very long time. When this one arrived I noticed how thick it was, compared to my previous mattress. I'm about almost a extra foot off the ground to get on the bed but that's okay. The first few days, I didnt sleep well. I just wasnt use to something new but after I'd say 3 days, I've slept great every night since. It's not overly hard and not too soft. I wake up feeling refreshed and I dont toss and turn. I sweat when I sleep, if in cold or hot. I noticed a huge difference with this mattress, I don't sweat nearly as much as I did before. That's where the cooling effect kicks in I assume, to keep you cooler and it works. It's very comfortable. Another thing I noticed is, it's much larger than my previous mattress but was lighter to move and place on my frame. That had me shocked. Overall, this is a great mattress and I love it!