What foundation does it need, and can it go on an adjustable base?

It is rated adjustable-base compatible, and the 884 pocketed coils flex at the head and foot. No box spring is required; the 12-inch hybrid is self-supporting and works on a platform bed, a slatted frame with gaps under about 3 inches, or a solid foundation. A fully supportive, even surface is important here, since gaps or a sagging old base can let the mattress dip and may affect both feel and warranty coverage.

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