Do I need a box spring with this mattress?

No box spring is required. This mattress's 875-coil pocketed core supports itself and needs only a flat, rigid foundation: a platform, slats under 3 inches apart, or a non-flex box foundation. A springy traditional box spring works against the extra-firm 9-out-of-10 feel and is unnecessary. Even, solid support across the base keeps that firm feel consistent and the 10-year warranty valid.

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