Does this mattress need a box spring or special foundation?

It needs firm, even support, not a traditional bouncy box spring. This 17-inch hybrid performs best on a sturdy foundation, solid platform, or slats spaced under about 7.6 cm apart so the 2014-coil core stays fully supported. A flexing old box spring can void the warranty and let the soft top dish out. The matching Stearns & Foster foundation or any rigid base works.

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