BEST FOR BACK PAIN: Provides lower back support with 3 different support zones. FIRM SUPPORT FOR MID-SECTION: Ultra-dense foam beneath your midsection provides support and pressure relief by elevating your hips and midsection. COUNTOURING COMFORT BENEATH YOUR SHOULDERS: The head and foot portions of the Topper contour to your body and provide cradling comfort beneath your shoulders. COOLING: Made with our cool-to-the-touch GlacioTex Cooling Cover. Designed to maintain an optimal sleep temperature. Enjoy a cool, comfortable night’s rest while benefiting from superior support and pressure relief. ONLY THE BEST MATERIALS: This bed in a box mattress is Fiberglass-free, GREENGUARD Gold certified, and made with CertiPUR-US certified foams. Each mattress is carefully assembled in our own Arizona facility and delivered right to your door. We want you to be happy with your mattress and that's why we offer a 120 night sleep trial. Cool, Comfortable, and Supportive Rest. Add support and spinal alignment to the surface of any mattress with the ErgoAlign Mattress Topper. This innovative 3 inch mattress topper is ideal for those with frequent lower back pain because it features a segment of ultra-dense foam beneath your midsection to provide additional support and pressure relief where you need it. We've chosen the highest quality materials and assembled them all in our Arizona factory to ensure you enjoy a premium, durable feel.