The 4000 Series Mattress Collection has all the features to help you sleep supported, comforted and cooler. Individually Wrapped Coils support every section of your body with added Lumbar Support. Comfort layers include Adaptive Foam - the next generation of Memory Foam that adapts with out the heat of your body. An additional layer of coils, Micro Coils, deliver body conforming support and comfort. Gel Fibers and Cool Foam quilting keeps you fresh and cooler. These mattresses have everything you need to get a luxurious nights rest.