Celestial Silk pillowcases are made with 100% mulberry silk. Silk pillow cases breathe easily and are naturally hypoallergenic, making them the perfect choice for allergy sufferers. Dermatologists, hair stylists and beauticians recommend silk pillowcases to keep hair and skin moisturized. Using silk pillowcases is a natural beauty technique that provides results while you are sleeping. Not only will silk pillowcases help you achieve sleeping beauty status, but with the luxurious caress of silk, you will feel like royalty. Caring for silk is relatively simple. Our pillowcases are machine washable in cold water on the delicate cycle. Either line dry or machine dry on delicate cycle. To maintain the silky luster without wrinkles, promptly remove from dryer when 90% dry, or iron using the silk setting.Includes one zippered silk pillowcase: King (20"x36") or Queen Sized pillowcase - 20" x 30" - which easily accommodates both standard and queen sized pillows.