I bought the CasperWave as it was the most comfortable and toted to be a cooler sleep. With the new mattress, I ordered the mattress protector as well. The first few weeks on the new bed were the hottest I’d ever been. I was on the verge of returning the mattress because of this but decided to try a different protector first before the hassle of a return. What a difference it made!  Sleep is much more as advertised and new protector was donated.