First of all, these aren't perfect. There are pros and cons. However, I am giving five stars because they have improved my sleeping comfort in high summer. First, they really are cooler blankets. I use these over a sheet and can feel the coolness. However, over time, they do warm up with body heat and aren't as cool. Still, I am liking them in warmer temperatures for that cooling effect that helps me fall asleep. But they don't keep me cool all night for two reasons--they do end up warming up wiSee full review