VÉNERA silk pillowcases are made of the highest grade (6A) long fiber 22 MM 100% pure mulberry silk on both sides. VÉNERA silk pillowcase is hypoallergenic, breathable , temperature regulator ,super soft & smooth. Both sides of this silk pillow covers are constructed from 100% 22 MM mulberry silk which gives it a smooth finish and double-sided use. Silk pillowcases, reduce friction, allowing skin to glide along the pillow, which can reduce pressure on creased skin. 100% Pure Mulberry Silk has been tested and proven to Prevent Wrinkles, Regulate Sleep Temperature, Protect Hair Damage & retain moisture. BETTER SLEEP, BETTER SKIN OEKO-TEX certified to be free of chemicals and colored with environmentally-safe dyes; Because of the smooth soft surface of silk, your delicate skin and hair follicles gently glide across the surface, making it perfect for those with sensitive skin. Sleeping on a silk pillowcase makes your face better hydrated and is also beneficial to those with dry skin.