4 Pack 100% Cotton Allergy Control Pillow Protectors by Great Bay Home. Hypoallergenic Dust Mite & Bed Bug Resistant 400 Thread Count Zippered Pillow Covers. Lifetime Replacement. (King) 100% Cotton TIGHT WEAVE, MULTI-PURPOSE COVERAGE: These anti-microbial ZIPPERED pillow protectors have a PORE SIZE of just 3-4 MICRONS to effectively block bed bugs, dust mites and allergens from getting through. They will also protect your pillow from saliva, perspiration, liquids, stains and basic wear and tear. ALLERGY CONTROL: Easy, affordable way to control sneezing, itchy throat, stuffy nose and other allergy symptoms so you can get a good nights sleep. Perfect for down feather pillows and any other kind of pillow! HIGH-QUALITY COMFORT: Features 400 thread count 100% cotton for a soft, smooth and noiseless look and feel. EASY CARE: Machine washable and long lasting. SIZING: Standard 20" x 26", Jumbo / Queen 20" x 30", King 20" x 36". LIFETIME WARRANTY 100% SATISFACTION GUARANTEED | Customer satisfaction is of utmost importance to us. We're confident you'll love our products, but if you're not 100% SATISFIED, our customer service team will work with you to make it right!