Do I need a box spring for this mattress?

No box spring is needed. This pillow top firm stands 15 inches tall on a self-supporting 875-coil core, so all it requires underneath is something flat and rigid that does not flex: a platform bed, closely spaced slats, or a low-profile foundation if you want a little height. Skip the bouncy old-style box spring, which works against this bed's firm 8-out-of-10 pillow-top support. Steady, unbroken support also keeps the 10-year warranty intact.

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