Does this 12-inch foam mattress need a box spring?

No traditional box spring is needed, and a bouncy one is the wrong support for foam. This 12-inch all-foam mattress needs a flat, rigid surface: a solid platform, a foundation, or slats spaced under about 7.6 cm apart. Wider gaps let the foam sag into them and can void the warranty. A plain frame with a non-flexing foundation or close-set slats supports the medium build evenly.

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