100% Mulberry Silk, 25mm CERTIFIED & TESTED: Our product is tested against over 1,000 harmful substances by OEKO-TEX STANDARD 100. Suppliers in a MADE IN GREEN by OEKO-TEX certified supply chain must take actions to protect workers, ensure safe working conditions and strengthen healthy labor practices. LUXURIOUS BEDDING: Our pillowcase is made of 100% long strand, Grade 6A Pure Mulberry Silk. There is silk on BOTH sides of the pillowcase! The density of silk is measured by momme. The higher the momme, the more silk. We have added a unique side entry that is slightly offset. The pillowcase can be used as both a sham and pillowcase. An oversized envelope flap ensures the pillow will remain securely inside your pillowcase. BEAUTY BENEFITS: 100% Pure Mulberry Silk has been tested and proven to Prevent Wrinkles, Regulate Sleep Temperature & Protect Hair Damage. SIZING: Our Standard measures 20" x 28", Queen pillowcase measures 20" x 30", and King measures 20" x 36". CARE INSTRUCTIONS: Dry clean or hand wash are the best methods. You can also machine wash on the gentle cycle. We suggest using a mesh wash bag when do so. Lay flat to dry.