Our advanced Spinal Zone® Nanocoil® crown incorporates hundreds of microcoils in the core support region of the mattress, delivering responsive comfort and relieving lower back pressure. This innovative NanoCoil® technology enhances airflow, boosts coil count, and ensures consistent, long-lasting comfort. The mattress also features 800 individually wrapped coils with reinforced perimeter support for enhanced durability and reduced motion transfer. A quilted zoned cooling cover combined with gel-infused foam layers promotes breathable, temperature-regulated rest. Completing the design is our patented Spinal Zone support system, which increases durability and helps ease back pain and stiffness for a more restorative sleep. Engineered to support your new Mattress with a perfectly solid, flat surface, the Fieldcrest 9" flat foundation is designed to take the place of a traditional box spring and can be placed directly on your existing bed frame. Designed and upholstered to create a seamless look with your new mattress and complement your bedroom decor—while providing stationary support. Set includes mattress plus box spring/foundation/base. Larger size mattress sets may feature 2-piece side-by-side foundations for easier navigation in tight spaces.