My wife and I have had a Tempurpedic Mattress since 2004. That wonderful mattress was replaced by another Tempurpedic in 2018 that proved to be just too hard. We kept trying to adapt but always had sore shoulders and upper arms and hitches in our hips and lower backs. I was almost ready to rid ourselves of an expensive mistake when I read a review by someone who pointed out he had the same problem and it was solved by adding a "Tempur-Adapt+ Cooling Topper". I got the purchase approved with the argument, "what do we have to lose?" and about 2 weeks later we woke up without pain. Besides softening the surface of the firm mattress, it does nothing to turn it into an unstable soggy soft mattress. In fact if I had it to do again, I would order the firm mattress and the Tempur-Adapt + Cooling Topper at the same time for a Perfect Mattress.