ESK Colletion 100% Cotton Dust Mite & Allergy Control Standard Pillow Cover, 27" X 21" for Standard Size, Set of 2 Provides the perfect physical layer to protect against Bed Bugs, Dust Mites & Allergens. This 100% Cotton Waterproof Pillowcase Protects Against Spills, Perspiration, Saliva, and Other Fluids Maintains performance & efficacy after repeated washings up to 150 Fahrenheit. Lifetime warranty - Set of 2 - Approx Size: 27" x 21" For Standard Size Brand:ESK Collection