Do I need a box spring under this mattress?

No box spring is needed. This bed is a 13.5-inch foam-encased hybrid that performs best on a firm, flat surface: a platform bed, closely spaced slats, an adjustable base, or a solid low-profile foundation. An old-style coil box spring actually flexes too much and can shorten the life of the pocket-coil core, so skip it. Any sturdy base that fully supports the perimeter will keep the 10-year warranty intact.

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