So comfortable!  Just like sleeping on a cloud. I find the temperature to be perfect, my husband thinks it’s hot. However, he sweats at night no matter what I try, so I’m not terribly disappointed he still sweats with this. At least he’s sweating in comfort!!  We got the 4” topper and I’m so glad we did. I think anything else would have been too thin to have felt the full effect. We both have severe arthritis in back, shoulders, hips, neck and these have helped so much!  I can actually get out of bed in the morning and stand upright!!