With the Hybrid 1200 king mattress and foundation set, you have endless possibilities for restful sleep. Feel the support of a truly traditional coil mattress which contours to your body for a comforting feel. High-density foam provides the firmness you love. Gel memory foam provides restorative support for your lower back. The mattress riser is an all-in-one support system that takes the place of an ordinary bed frame and box spring. The metal unit sets up quickly, without using any tools, to create a sleep haven with unwavering support. Included brackets attach the riser to a headboard. Even better: The clearance from frame to floor is incredibly spacious and ideal for under bed storage.