Material: 100% 25 momme mulberry silk on both sides, Grade 6A quality,soft, thick and durable. This terse style silk pillowcase has an envelope closure which is more beautiful and classic than zipper closure style, and uses much more silk fabrics.Our luxury silk bedding can be tossed right into the washing machine without the fear of fading or shrinkage. Machine washed on a gentle cycle in cold water with silk-friendly detergent and air dry. With a heavier weight quality silk around 25mm will give you many years of use with proper care.High quality mulberry silk is super breathable, and hypoallergenic. It is cool to sleep on and can help prevent bed sweats. It has many amino acids that are believed to slow the aging process and the smooth fire and tight weave allows your skin and hair slide over the pillowcase gently. That’s why people use silk pillowcase for anti-aging, anti-wrinkles, anti-hair knotted/loose.Size:20x 36inches (51x91cm), fits standard/queen pillows.The envelope closure over 7 can hold the pillow very well, prevent the pillow from slipping out.Gift package! Each pillowcase is handmade according to our high standards and wrapped in a beautiful box.