The BedCare Classic dust mite and mold-impermeable allergen pillow cover is made of a lightweight polyester knit fabric bonded to an ultra-thin, allergen-proof ComforTech polyurethane membrane that makes this a waterproof pillow cover as well. Because of its barrier membrane, this protective pillow cover cannot be measured in terms of mean pore size though It is nearly zero! The soft, satin-like fabric stretches as you move for supreme comfort, making this an excellent allergen pillow cover for your bed. Zipping your pillow into this encasement provides total protection on all sides with no gaps or openings. Machine washable and dryable. Lifetime Warranty.Dust Mite Proof The Bedcare Classic Pillow Cover Eliminates Exposure To Dust Mites And Other Allergens And Completes Zips Around He PillowBed Bug Proof As An Added Bonus This Cover Is Also Bed Bug Proof Made With Our Patented Bugshield System With An Auto Lock Zipper That Will Not Backtrack When Closed The Bugshield Bug Blocker Is An Added Barrier That Closes The Last Inch Or So Of The Zipper From Below To Create A Fabric Shield Under The Zipper Closure To Doubly Ensure That Bed Bugs Will Not Be Able To Get In Or Out Of The EncasingWaterproof Not Just Water Resistant This Cover Will Stop All Spills Or Liquids From Getting On Your MattressNo Crinkling Noise When You Sleep And No Latex Vinyl Or Harmfull Resins UsedMade In The UsaOrigin- Domestic Features: Breathable, Water Resistant, Allergen Barrier, Dust Mite Barrier, Bed Bug Blocker Bedding Closure Type: Zipper Measurements: 37 Length/Inches, 21 Width/Inches Base Material: 100% Polyester Care: Machine Wash Mattress Pads & Toppers Type: Mattress Protectors Country of Origin: Made in US