Do I need a box spring with this mattress?

No box spring is required. This 15.5-inch hybrid needs a flat, firm, supportive surface: a platform bed with slats no more than a few inches apart, a solid foundation, or an adjustable base. A traditional box spring is designed for older innerspring beds and can let a modern pocketed-coil hybrid flex unevenly, so a rigid foundation is the better choice for support and warranty.

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