Do I need a box spring, or can I put it on an adjustable base?
No traditional box spring is needed. This Posturepedic Plus hybrid is adjustable-base compatible and otherwise needs a solid or closely-slatted flat platform (slats no more than about 3 inches apart). A sagging old coil box spring would undermine the zoned pocketed-coil core and can affect warranty coverage, so use a sturdy flat foundation or compatible adjustable base.
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