Patented NxG™ Advanced Memory Foam contours rapidly to movement, cradling and supporting your body no matter what position you sleep in. NxG Advanced Memory Foam returns to its original position in 4.6 seconds or 2 times faster vs. 10 seconds for traditional memory foam. ComforPedic™ foam responds to body pressure, allowing you to move freely without that quicksand feeling you can get from traditional memory foam.