Comfort level: firm High-density charcoal-infused gel memory foam High-density support foam Base support foam 918 power packed 15-gauge wrapped coils Ashley Edge "steel encased"; 2 perimeter rows of 13-gauge wrapped coils for edge support 4-way stretch cover Luxury pillow pocket technology Adjustable base compatible 10-year non-prorated warranty Note: Purchasing mattress and foundation from two different brands may void warranty; check warranty for details Foundation/box spring available, sold separately Mattress ships in a box; please allow 48 hours for your mattress to fully expand after opening