Does this firm memory foam mattress need a box spring?

No, and a bouncy box spring can undermine an all-foam bed. This mattress needs flat, continuous support: a solid platform, closely slatted frame, flat foundation, or adjustable base. Keep any slat gaps under roughly 3 inches so the dense TEMPUR core stays evenly supported. Skipping a sagging old box spring also protects the structure that keeps this firm feel consistent and the 10-year warranty valid.

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