Does a memory foam mattress like this need a box spring?

No traditional box spring is required, and a bouncy one can actually harm it. This all-foam Tempur-Align needs flat, firm, continuous support: a solid platform, a foundation, or slats spaced under about 7.6 cm apart. Gaps wider than that let the foam flex into them and can void the warranty. A flexing spring box gives the wrong kind of support for an 11-inch foam bed.

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