1st memory foam mattress. I like that you can move without waking your significate other but not ecstatic about mattress. I don't see where it's really that cool either. I think my box spring mattress was a little bit cooler when it comes to heat transfer. Either way, I think it will hold it's shape more compared to spring coils. It was weird to learn that they don't recommend using heated blankets due to materials in mattress. Kindly, Melinda