Do I need a box spring with this mattress?

No box spring needed. This tall 14-inch firm tight-top wants a rigid, gap-free base so its 884 coils can deliver the flat, level support they are tuned for: a platform bed, a solid foundation, an adjustable frame, or slats under roughly 3 inches apart. A worn spring box flexes unevenly and undercuts that firm feel. One owner runs it happily on an adjustable frame. In Canada the mattress and base are bought and trialled apart, so settle your base first.

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