FULLY-ZIPPED PROTECTION | National Allergy pillow covers ensures full coverage with a fully zipped enclosure and autolocking zipper so you can rest easy knowing you??re protected from harmful bed bugs, dust mites and allergens from all ends100% BREATHABLE COTTON | Our all cotton pillow protectors are woven super-tight for ultimate protection, breathability, and comfort. Our pillow cover is the only truly breathable allergen barrierCOMFORT, MEET PROTECTION | National Allergy offers a truly breathable allergen barrier with a pore size of 3-4 microns, ensuring that dust mites and allergens will not get through. With 100% breathable cotton, this dust mite and allergy control pillow protector guarantees comfort and protectionLifetime WarrantyCertified Asthma & Allergy Friendly – AAFA joined with Allergy Standards Limited to create the asthma & allergy friendly Certification Program. This program helps patients to understand product claims and make informed purchases. Household products are tested against strict standards. If products pass the AAFA tests, they earn the asthma & allergy friendly Certification Mark. When you see this Mark, you know the product is proven to be better suited for those with asthma and allergies.