The BedCare Classic dust mite and mold-impermeable allergen covers are made of a lightweight polyester knit fabric bonded to an ultra-thin, allergen-proof ComforTech polyurethane membrane that makes this a waterproof encasing as well. Because of its barrier membrane, this encasing cannot be measured in terms of mean pore size. The soft, satin-like fabric stretches as you move for supreme comfort, making this an excellent allergen cover for your bed. Zipping your mattress, pillow or comforter into the encasement provides total protection on all sides with no gaps or openings. Machine washable and dryable. Why BedCare Classic BedCare Classic is our most popular non-cotton fabric. Highlights include: 100% stretch polyester joined to an ultra-thin urethane membrane for high level of allergen and waterproof protection Circular poly knit fabric is soft and cool to the touch with the look and feel of satin. No crinkling or noise while you sleep No shrinkage, even in hot water wash No Latex Made in USA Includes our BugShield Two-Part System The BugShield Two-Part System There are two parts to the BugShield system: the Zipper-Lock and the Bug Blocker. The BugShield Zipper-Lock is an auto-locking zipper that locks the zipper slide in place so that it will NOT backtrack to leave small openings that bed bugs could sneak through. The zipper cannot accidentally open. To open the zipper, the zipper tab must be pulled. 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 encasing. While most sewing manufacturers are going "off shore," we proudly make all of our allergen covers in the USA. Skilled American craftsmen take care in making each cover because your health is important, a job they take very seriously. Each cover is also individually hand inspected throughout fabrication to maintain top quality. Product ID 65583460