The Hybrid 1200 mattress and king mattress foundation set is simply a better way to get a great night’s sleep. The mattress gives the contouring support of a traditional coil mattress and the firmness of gel memory foam, providing restorative support for your lower back. The riser is an all-in-one support system that takes the place of an ordinary bed frame and box spring. And setup is as easy as 1-2-3. Step one: Follow the riser’s quick and easy "no tools" assembly instructions. Step two: Remove the mattress from the box and unroll. You’ll be amazed at how it fully expands within minutes. Step three: Enjoy a great night’s sleep. 12 Inch Ashley Hybrid - Gray - 2 Pc. - King Foundation And Mattress 74.0"W x 79.0"D x 14.0"H - 189.79 lb