Does this mattress need a box spring or foundation?

No box spring. As an all-foam mattress it needs a solid, flat, evenly supportive base: a platform bed, slats spaced no wider than three inches, or a bunkie board over an existing frame. A sagging or springy foundation lets the foam dip unevenly and can void the 10-year warranty. Any rigid, gap-free surface keeps the 7.5-inch high-density core fully supported and holding its firm feel.

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