The MISSION: ALLERGY Premium Microfiber Fabric on the outside of these pillows is the ultimate allergen-barrier, totally effective and silky soft. With a mean pore size of 2 microns it blocks all allergens, yet is air-permeable, making it completely comfortable to sleep on. It is not hot and sweaty, as are barrier-fabrics made with membranes; does not allow any allergen escape, as do many cotton barrier-fabrics; and does not accumulate surface allergen, as do barrier fabrics made with terry cloth or non-woven fabric. These MISSION: ALLERGY Allergen-Proof Pillows are filled with luxurious DreamFill, ultra-fine fibers that are as soft as silk, with superior lofting quality and a down-like feeling, providing softness, resilience, and comfort. These medical-grade pillows are suitable for adults or children with allergic asthma, allergic rhinitis, or allergic eczema (or simply for good hygiene). They are the ultimate non-down, allergen-proof pillow for comfort, protection, and durability. 100% Woven Polyester Microfiber shell; 100% polyester filling. Note: These allergen-proof pillows are available exclusively from MISSION: ALLERGY. Do not confuse them with other pillows sold as “hypoallergenic”. The term “hypoallergenic” refers only to the fact that the interior filling of the pillow does not itself cause allergy—not to whether it can become colonized with dust mites! Our pillows have a Premium Microfiber allergen-barrier exterior, and thus cannot become colonized with mites (or bedbugs). They therefore do not require encasing or hot water washing. “Be sure you get … from a reputable company, like Mission: Allergy…” THE NEW YORK TIMES: Much Ado About Dust Mites “Say sayonara to dust mites. Dr. Fost recommends Mission: Allergy.” HEALTH MAGAZINE: How healthy is your bedroom? “Skip the cheapie versions…invest in Mission: Allergy Premium Microfiber…” MEN’S HEALTH MAGAZINE: Clearing the Air on Allergies