When it comes to your comfort, discover the Chime 12-inch twin mattress and foundation set. The mattress's thick layer of memory foam contours to your body, delivering amazing support, pressure relief and comfort. Its memory foam layer is supported by a super thick layer of firm support foam. The included foundation 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 and without using any tools, creating 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.