From National Allergy® BedCare, this box spring cover features:  The BedCare Classic dust mite and mold-impermeable Low Profile Boxspring cover is made with a shorter depth to accommodate box springs with 5-7 inch depths for better fit. It is constructed of a lightweight polyester knit fabric bonded to an ultra-thin, allergen-proof ComforTech polyurethane membrane that makes this a waterproof cover as well. Because of its barrier membrane, this protective cover cannot be measured in terms of mean pore size though It is nearly zero! The soft, satin-like fabric stretches as you move for supreme comfort, making this an excellent allergen cover for your bed. Zipping your boxspring into this encasement provides total protection on all sides with no gaps or openings. Machine washable and dryable. Bed Bug Proof: As an added bonus, this bedding set is also bed bug proof. Made with our patented BugShield system with an auto lock zipper that will not backtrack when closed. 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. Twin approx. 75" x 39" Twin Extra-Long approx. 80" x 39" Full approx. 75" x 54" Queen approx. 80" x 60" Made in the USA.