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Do I need a box spring with this hybrid mattress?

No. This 1000-coil World Class hybrid needs only a flat, even surface: a platform bed, a slatted frame with gaps under 3 inches, an adjustable base, or a box spring if that is your frame. Even support is what keeps the firm 8 out of 10 feel and coil response consistent and the 10-year warranty valid. Skip any sagging foundation or wide-spaced slats, which let the coils dip unevenly and form soft spots.

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