Allersoft Square Cotton Pillow Cover, 30 by 30-Inch 100% Cotton Made in US 100-Percent pure cotton Bed Bug and Dust Mite Barrier No polyester or synthetic fiber, no latex, no vinyl or membrane lining, no phylates, no harsh chemicals or antimicrobials added Ultra fine, patented weave allows for filtration of allergens and bugs but offers the comfort of fine sheets and cool, comfortable sleep Complete zippered enclosure locking out Bed Bugs Machine washable and Lifetime warranty