Does this mattress need a box spring or foundation?

Yes. This Eurotop's 700 continuous coils need an even surface beneath them, so pair its 9.5-inch Euro-top build with a box spring or a sturdy slatted base, slats under 3 inches apart, no broken ones. A sagging or gapped base lets the linked coil unit flex unevenly and softens the plush top prematurely. Because the comfort layer is already soft, a firm, level foundation matters here to keep support consistent and protect the 10-year warranty.

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