The Resilient Firm Tight Top Mattress by Serta delivers targeted support and refreshing comfort for a restful night’s sleep. Featuring a 3-zone design for enhanced lower back support, it combines a breathable cover with Serta® GEL Fiber to keep you cool and comfortable. The 820 3-Zoned Edition Custom Support Coil System with Best Edge® Foam Encasement ensures lasting support across the entire surface. Adjustable base friendly and crafted with CertiPUR-US® certified foams, this mattress is built for dependable comfort and durability.