Do I need a box spring with this mattress?

No box spring is required. This mattress's 875-coil pocketed core is self-supporting and needs only a flat, rigid foundation: a platform bed, sturdy slats spaced under 3 inches apart, or a non-flexing box foundation. A traditional springy box spring is not needed and can undercut the firm 7-out-of-10 feel. Whatever you use, solid even support is what keeps the 10-year warranty valid.

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