The adjustable king power base with adjustable head only comes with an 8" Memory Foam Mattress. When it comes to your comfort, discover the 8-inch memory foam mattress. Its memory foam contours to your body delivering amazing support, pressure relief and comfort. The memory foam layer is supported by a thick layer of firm support foam. Plus, this mattress is made of hypoallergenic material, keeping dust mites, pollen, mold and pet dander out.