From National Allergy® BedCare, this mattress cover features:  BedCare Organic All-Cotton Mattress Covers are made of unbleached 100% GOTS (Global Organic Textile Standard) Certified Organic Cotton so you know you have the very best quality available. With a pore size of just 4.8 microns, only air can permeate this tightly woven fabric, for total protection from dust mite allergens and bed bugs while you sleep. The quality of these zippered mattress covers is guaranteed because of the care American craftsmen put into each and every one. Even the most discriminating cotton lovers will be delighted with Organic All-Cotton mattress encasings. Machine wash and dry. Dust Mite Proof: BedCare Organic All-Cotton Mattress Covers eliminate exposure to dust mites and other allergens. The cotton barrier fabric is woven so tightly that only air can get through. 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. Fits mattresses up to approx. 18" Queen approx. 80" x 60" King approx. 80" x 78" Cal King approx. 84" x 72" Long Twin approx. 80" x 39" Made in the USA. National Allergy® BedCare Organic Cotton Allergy and Bed Bug Proof 18#double; Mattress Cover