Do I need a box spring under this mattress?

No box spring is required. This 14.5-inch coil-and-foam bed needs firm, flat, continuous support: a platform, a slat base with narrow gaps, a solid foundation, or a compatible adjustable base. An old-style coil box spring flexes too much beneath a pocketed-coil mattress, can let the surface dip unevenly, and may void the 10-year warranty. The aim is a stable, level surface so the 1050-coil unit performs as designed.

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