Eclipse 11” Memory Foam Mattress features a top layer of Open Cell Memory Foam breathes more efficiently than traditional closed cell foams, encouraging air to move through the mattress to regulate temperature rather than hang onto heat. Memory foam’s signature exacting softness will welcome you each time you lie down, conforming to your body and helping side and back sleepers relax free of pressure points. Though it feels soft, the Eclipse 11” includes a layer of stable Transition Foam as well as a sturdy, seven-inch High Density Foam core, which aligns and supports your spine and back as you sleep.