Why just sleep when you can Sierra Sleep? With the Sierra Sleep’ Hybrid 1200 mattress, 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. Plus, this mattress arrives in a box for quick and easy setup. Simply remove the plastic wrap and unroll. Foundation/box spring available, sold separately. Ashley - Gray - King Mattress - Hybrid 1200 75.0"W x 79.0"D x 12.0"H - 143.79 lb Ashley - Gray - California King Mattress - Hybrid 1200 71.0"W x 83.0"D x 12.0"H - 149.88 lb