Offered in standard sizes. 1000 Beautyrest pocket-coil springs. Ventilated, dynamic-response memory foam. Plush coils of 15.5-gauge wire. Mattress crown height: 13H in.. Air-cool gel memory foam layer. Dual-cool technology memory foam. Offered with optional box spring. Every little thing that's ever stood between you and a good night's sleep is addressed as soon as you bring home the Beautyrest Silver Hybrid Preston Luxury Firm Mattress with Optional Box Spring. This innovative mattress uses old and new technologies to create the best possible sleep experience. At the center are 1,000 individual pocket-coil springs that adjust independently to the weight and contour of your body for maximum motion separation, so no one else wakes up when you roll over. A layer of ventilated, dynamic response memory foam provides further back support, while a layer of air-cool gel memory foam helps air circulation for a cool, comfortable sleep. The top layer is Dual-cool technology memory foam, a material that contains natural silver to help pull heat away from the surface of the mattress. The silver is antimicrobial, allowing it to prevent the growth of mold, mildew, and any odor-causing bacteria. An optional box spring is available to provide rigidity and perfectly fit this mattress. This mattress is available in standard sizes. Size: Queen.