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Free Flex® Innerspring with Custom Support™
This coil innerspring system has zones of single and double rows of coils that mirror the shape of the human body. This unique construction ensures proper spinal alignment to help support your back and give it the rest it needs. The Custom Support™ Innerspring also provides 25% more support in the center of the mattress where you need it most. The exclusive foam encasement surrounds the innerspring to give you complete edge to edge sleep surface as well as a firmer seating edge. (It is so durable that a trailer truck can roll over it, and the springs bounce right back.)