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This is a full-encasement mattress protector with a zippered, triple-seal closure that seals a mattress on all six sides to trap bed bugs and dust mites inside. The three-layer knit polyester is water resistant, stain resistant and breathable, and it fits mattresses up to 15 inches deep in Twin, Twin XL, Full, Queen and King. It is OEKO-TEX Standard 100 certified and machine washable. It suits households treating an active infestation or guarding against one, and allergy sufferers. Against fabric-only covers it adds a real zipper seal, but it is not a waterproof barrier and the polyester knit runs warmer than cotton terry covers.
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Lowest price we've seen: $18.00 on Nov 10 at Poshmark. Tracked across 7 stores since Nov 10.
Ratings are decent but not glowing. Owners like the full zipper seal and the protection it gives during bed bug treatment, while a recurring share complain about fit, warmth and zippers that split or snag.