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

No box spring is needed; what this tall plush Euro top wants is a rigid, non-flexing base. A platform bed, closely spaced slats, a solid foundation, or an approved adjustable base all give the steady footing the 1050-coil unit needs. An old flexing coil box spring lets the soft surface dip unevenly and can void the 10-year warranty. Given the 15.5-inch height, also check your frame supports the added weight and depth.

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