Combining a posturetech 660 spring system and a layer of sumptuous memory foam allows for the sealy pearl reflexion posturepedic mattress to provide copious amounts of both comfort and supportthe posturetech 660 spring system works to evenly distribute your body weight at certain pressure points meaning yoursquore less likely to toss and turn during the night as comfort levels maintain their consistency this spring system is perfectly complemented by a top layer of memory foam that matches