OK, this is a high quality mattress. The descriptors though are not quite accurate as this "medium" is actually quite firm and does not adequately support side sleeping (back and stomach sleeping is great). The mattress top IS cooling to the touch but does warm up through the night. I would fall asleep cool and would wake up "clamy." Not necessarily sweating (which is improvement) but that strange pre-sweat stickiness. I bought other cooling sheets to go with and had the same experience. Ultimately I did return this mattress because it is VERY large (difficult to keep sheets on, even with the clip do-hickies) and too firm for my side sleeping. Were I not a side sleeper I would 100% have kept this mattress. Again, it is a super high quality mattress and would be ideal for back or stomach sleepers. Luckily, Wayfair has excellent customer service and I was able to exchange the mattress over the phone.