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.