Experience the trusted comfort of Serta with Serta® Classic®. Featuring a soft, breathable cover, Pillowsoft® Aire Foam, and an 800-density coil support system, this mattress helps you sleep comfortably and wake ready to ease into your day. With 3 zones for lower back support, plus a gel memory foam upgrade for even more pressure relief, this mattress balances cool breathability with responsive support and pressure relief for a classically comfortable rest. The Serta Flat Mattress Foundation is a 9" box spring alternative and provides the perfect support for your Serta mattress and is designed to provide durability and long-lasting comfort. Pairing this bed base with your mattress will support it and extend its life while helping isolate the effect of your partner’s movements in bed. 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.