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Do I need a box spring with this mattress, or what foundation works?

You do not need a traditional box spring. This 15-inch hybrid performs best on a solid or slatted platform, a flat foundation, or an adjustable base. If you use slats, keep gaps under roughly 3 inches so the pocketed coils stay fully supported. A sagging old box spring is the one base to avoid, since it undermines the coil support and can affect warranty coverage.

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