I was slightly skeptical when purchasing sheets as I am always hot when sleeping and doubted that a set of sheets could help keep me cool over night. These sheets are soft as butter and do in fact keep me very cool. They have also held up in multiple washes thus far. The only reason for 4/5 stars is that there is a lot of excess sheet that bunches on the surface of the mattress despite being used on a deep tempurpedic mattress. Otherwise, amazing.