This is the first Tempur-Pedic mattress I've ever owned, and I must say, I'm impressed. This mattress is 11.5 inches thick and is made with a Dynamic Support Layer on top of the Tempur-Response layer and the SmartClimate system. The Dynamic Support Layer does an excellent job of providing firmness with comfort, which does wonders to prevent the back pain suffered from sleeping on my previous mattress. Even on nights when I toss and turn, this mattress responds quickly and supports my every position. I'm also a big fan of the EasyRefresh mattress cover, which is easy to remove and throw in the washing machine. After sleeping on this mattress, I can't imagine ever buying anything different for my home.