Mattress Cover With A Zipper For Allergies By Allerease, Twin. From the #1 best selling allergy bedding brand, AllerEase Waterproof delivers the clean, healthy night's sleep that we all deserve. Featuring premium materials and an expertly-designed construction, Waterproof prevents dust, pollen, and pet dander from collecting in your mattress. With a soft waterproof layer to protect from spills and stains, Waterproof also features machine washability and a lifetime warranty to offer unmatched quality, convenience, and value for you and your family. 100% Polyester Imported ADVANCED ALLERGY PROTECTION: AllerEase mattress protectors have tightly woven, expertly-designed fabric to prevent 99.9% of unhealthy household particles from collecting in your mattress. WATERPROOF DESIGN: This mattress protector features a waterproof design that prevents liquids from contaminating and ruining your mattress, making it kid and pet proof! EXTENDS MATTRESS LIFE: Fully encasing your mattress with a durable and comfortable allergy mattress topper extends the life of your mattress by keeping it fresh and clean. A PERFECT FIT: Our exclusive FlexFit technology provide a perfectly snug fit with a soft, quiet cover that can help you sleep comfortably through the night. ALLERGIST RECOMMENDED: All AllerEase products provide clean allergy relief, are machine washable, and have a Lifetime limited warranty.