Have been sleeping on the Hybrid Premium silver chill firm tight top now for over a week. It's not only comfortable, I am actually sleeping throughout the night without tossing and turning AND sleeping cool. Even if/when I wake up in the middle of the night, instead of tossing and turning for up to 3 hours nightly, I roll over and fall asleep within a short amount of time. This firm mattress is not too firm, but gives enough to be very, very comfortable!