Does this hybrid need a box spring or a special foundation?

No old-style box spring is required. This Sealy Posturepedic Plus 1000 Series is a self-contained coil-and-foam system, and pairing it with a sagging box spring can actually void the warranty. Place it on a solid platform, slats under 3 inches apart, a bunkie board, or an adjustable base. The 1000 pocketed coils plus a 1.25-inch SolidBase and SolidEdge perimeter supply the support; the foundation only needs to be flat, firm, and able to carry the load evenly.

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