Why just sleep when you can Sierra Sleep? With the Sierra Sleep’ Hybrid 1400 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.