The Sealy Maximum Defense is a zippered, full-encasement mattress protector in a polyester-nylon blend. It claims waterproofing, an allergen barrier, antimicrobial treatment, bed bug blocking and moisture wicking, and it fits mattresses up to 14 inches deep. In Twin it measures 39 by 75 inches. The best new price is $55.99 at JCPenney as of November 7, 2026, with two stores carrying it new.
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Lowest price we've seen: $55.99 on Nov 7 at JCPenney. Tracked across 1 store since Nov 7.
Ratings are strong at 4.6 out of 5 from 27 ratings, and buyers generally treat it as a functional barrier protector rather than a comfort layer.