First of, the tempurpedic foam is amazing! So comfortable! The reason for 2 less stars is 1) the cover is so slick that when I laid on my bed the sheets move and get bundled up. I hate this so much, I almost returned it. 2) It says Cal King but on my bed it's about 2-3 inches too short. There is no grips under the pad so this mattress pad moves enough to require me to move the pad every night before bed. If this mattress pad simply just had another cover that had grips on the bottom and a less slick top, I would highly recommend. Unfortunately it missed those marks for us.
This product is still super comfortable - but I think I gave too much credit to the brand name thinking it could make it "cool." It's still super warm. I'd buy the topper 100% but I wouldn't spend extra on the cooling addition.
Every morning I woke with lower back and hip pain. No more with this wonderful topper. It took me awhile to make up my mind to send the money, but so glad I made the right decision. My only complaint is the cover was a challenge for one person my age.