Comfort level: firm High-density memory foam for support and comfort Firm support foam for added support and stability Luxury 4-way stretch knit cover for uniform comfort and durability Adjustable base compatible 10-year non-prorated warranty Note: Purchasing mattress and foundation from two different brands may void warranty; see warranty for details Foundation/box spring sold separately State recycling fee may apply Mattress ships in a box; please allow 48 hours for your mattress to fully expand after opening