Why worry when you can chime? With the Sierra Sleep Chime hybrid innerspring king mattress, you have endless possibilities for restful sleep. You get the best of the pressure relief of cooling gel-infused memory foam for superior support. Rest assured that high-density quilt foam provides the comforting feel you love. Plus, this mattress arrives in a box for a quick easy setup. Simply bring it to your room, cut away the plastic wrap, and unroll it. You will be amazed at how it fully expands within minutes. Foundation/box spring available and sold separately.