This silk sleep mask are made from 100% certified 6A mulberry silk . Our mulberry silk is 19 momme with non toxic  dyes. Silk is rich in amino acids and is similar to human skin tissue, so it is comfortable to wear and acts like your second skin. The friction of silk sleep masks is close to "0", which has a good protective effect on the skin around the eyes. Double-layer silk fabric, shading effect is close to 99%.