Does this mattress need a box spring, or work on an adjustable base?

No box spring is required, and yes, it is rated adjustable-base compatible. This 12-inch firm hybrid needs a flat, rigid foundation: a platform, a bunkie board, or slats no more than about 3 inches apart so the 1200 coils stay evenly supported. On an adjustable base, the pocketed coils flex with the frame as it raises the head and foot. A sagging or wide-slat base undermines the firm support and can make the bed feel softer or dip over time.

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