Do I need a box spring with this foam mattress?

No, and a traditional spring box spring is actually not ideal here. This all-foam bed needs firm, continuous support underneath: a platform bed, a slatted base with gaps under 3 inches, or a solid foundation. A bare sprung box spring can let the foam flex through the gaps over time. Solid, even support keeps the 8-inch HD core sound and protects the 10-year warranty.

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