Do I need a box spring with this mattress?

A box spring is optional, not required. What this medium-firm hybrid actually needs is a firm, flat surface: a platform bed, slats no more than 3 inches apart, an adjustable base, or a solid foundation. A box spring on a frame also works. The key is stopping the 600 pocketed coils from flexing through wide gaps, which keeps the feel even and helps protect the warranty.

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