Does a hybrid mattress like this need a box spring?
No. This Sealy Posturepedic Luxury Hybrid is a complete coil-and-foam system, so it does not need an old-style flexing box spring underneath, and using a sagging one can actually void the warranty. Set it on a sturdy platform, slats spaced under 3 inches, a bunkie board, or an adjustable base. The 1100 pocketed coils and SolidEdge perimeter provide the support themselves; the foundation only needs to be flat, firm, and able to bear the weight evenly.
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