Do I need a box spring with this hybrid mattress?

No box spring is required. This 13-inch hybrid needs only a firm, even surface, so a platform bed, an adjustable base, or slats spaced under 3 inches apart all work. A traditional box spring is fine too if your frame is built for one. The goal is uniform support under the 950-coil system; a sagging or wide-slat base lets the coils flex unevenly and can shorten the bed's life.

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