Does this extra-firm mattress need a box spring?
No box spring is required. This pocketed-coil bed needs a flat, firm, supportive surface: a slatted platform with gaps no wider than a few inches, a solid foundation, or an adjustable base. A traditional box spring is designed to flex with old connected-coil innersprings and can let this bed settle unevenly, which can also affect warranty coverage. A rigid, even base keeps the 815-coil system supporting you properly.
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