100% CottonTIGHT 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 night??s 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 36.100% 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!