The Sealy Posturepedic® Hybrid Edleston 12" Firm Tight Top Mattress combines lasting comfort and superior support to help maintain natural body alignment and reduce nagging Bed AchesTM. The orthopedic-inspired Posturepedic® Support System features exclusive PrecisionFit™ Coils, arranged right where you need them. Plus the Coil Edge provides a solid surface that's built to last. The hybrid construction combines these coils with Sealy® memory foam, creating an ideal sleep surface.