They said that the mattress was cool sleeping, but I was skeptical because everywhere you look online everyone is saying that foam mattresses sleep hot. This mattress DEFINITELY didn't sleep hot at all. I honestly didn't think I'd like a foam mattress, but I genuinely like this mattress. A couple days on it and I was sleeping a lot better, and my wife isn't waking me up in the night because the motion from her side isn't transferred to mine.