Pristine PREMIUM Dust Mite & Allergen Proof Mattress Encasing- Queen Patented and proven to protect against dust mites and bed bugs. Anti-microbial treatment to inhibit mold and mildew growth, with smooth microfiber material allowing air and moisture to flow to add to sleeping comfort Oeko-Tex Certified to be free of harmful substances that can irritate skin 248-thread count, 100% polyester microfiber provides a supple, cotton-like, feel but won't wrinkle, fade, or degrade after repeated washings like cotton With a YKK zipper, double stitching, binded seams, & dual material flaps at the zipper area to further block allergen particles, this encasing is built to last the test of time. Lifetime Warranty