ComforPedic® Next-Generation Memory Foam is designed to quickly contour to the curves of your body. But when you're sitting on the edge of the bed, you need a bit more support. Thanks to an innovative geometric construction, our Edge® Support System (available in our Natural™ and Mystere® models only) firms up the sides of the bed for stability while sitting and extends the sleeping surface of the memory foam mattress all the way to the edge