"GOOD HOUSEKEEPING APPROVED - Good Housekeeping magazine experts have awarded our silk pillowcase their prestigious seal of approval. Extensive testing is needed to receive this honor. LUXURY BEDDING - Our pillowcase is made of 100% pure mulberry silk long yarn of 6A grade. There is silk on both sides of the pillowcase! The density of silk is measured in momme. The higher the momme, the more silk. We added a single side entry slightly offset. The pillowcase can be used as both a pillowcase and a cushion cover. An oversized flap ensures the pillow will stay securely inside your pillowcase. HEALTH BENEFITS: 100% pure mulberry silk has been tested and proven to prevent wrinkles, regulate sleep temperature, protect hair and retain moisture. SIZE - Our standard size measures 20"" x 28"", Queen pillowcase measures 20"" x 30"", King size measures 20"" x 36"". Care instructions: Dry cleaning and hand washing are the best methods. You can also machine wash it on a gentle cycle. To do this, we suggest using a washing net. Lay flat to dry."