Do I need a box spring for this mattress?

No box spring is required. This 14.5-inch hybrid needs a firm, flat, supportive surface: a platform bed, a slatted frame with narrow gaps, a solid foundation, or a compatible adjustable base all work. Avoid an old-style coil spring box spring, which flexes too much under a coil mattress and can void the 10-year warranty. The goal is even support so the coil unit performs and the surface stays level.

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