100% Pure Silk Facial Beauty Pillowcase Pillow Cover with Hidden Zipper By Luckysilk. Standard, Queen and King Size. (Queen) Fabric: 100% Pure Mulberry Charmeuse Silk. 22mm Dermatologists recommend silk pillowcases for minimize wrinkles and prevent dry skin, frizzled hair. Silk is a natual protein fiber with many benefits: Hypoallergenic, natural flame resistant and antimicrobial. Has a right end hidden zipper. Well made with french seams. Size: Stardard (21