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 International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.