Does this 13-inch foam mattress need a box spring?

No traditional box spring is needed, and a springy one gives the wrong support. This 13-inch all-foam Tempur-LuxeAlign requires a flat, rigid surface: a solid platform, a foundation, or slats spaced under about 7.6 cm apart. Wider gaps let the dense foam flex into them and can void the warranty. Note the 13-inch height plus a base sits tall, so check your bed-frame and sheet depth before ordering.

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