Does this mattress need a box spring, and what foundation should I use?

No box spring is needed. This pocketed-coil hybrid wants a flat, rigid, supportive base: a slatted platform with gaps no wider than a few inches, a solid foundation, or an adjustable base. An old-style box spring is built to flex with traditional innersprings and can let this bed sag unevenly, which also risks the warranty. A firm, even surface keeps the 1000-coil system supporting you correctly.

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