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

No box spring is required, and yes, it is rated adjustable-base compatible. This 14.5-inch hybrid needs a flat, rigid foundation: a platform, a bunkie board, or slats no more than about 3 inches apart so the 1100 coils stay evenly supported. On an adjustable base, its pocketed coils and half-inch of springy latex flex smoothly with the frame. A sagging or wide-slat base undercuts the support and can make a medium bed feel softer than intended.

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