Standard Pillow Case (Size 21 inches x 27 inches) 100% COTTON Standard Pillow protector (Size 21" X 27") Pillow4you 100% Dust Mite & Allergy Standard pillow protector 100% pure cotton for the ultimate in comfort and breathability, Machine Washable - added Protection with The BugShield Zipper System This fabric is one of the most effective barriers against pet dander, dust mites, bed bugs and other harmful allergens. Lifetime warranty - Made in USA