Do I need a box spring under this plush mattress?

No box spring is needed. This is a self-supporting 15.5-inch hybrid built on an 1850-coil core, so it requires only a flat, sturdy surface beneath it. A platform bed, solid foundation, adjustable base, or closely-slatted frame all work. A box spring only adds height if you want it; it gives no support and is never structurally necessary for this mattress.

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