The outer layer and padding of our silk sleeping mask are made from 100% certified 6A mulberry silk . 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. And the sleep mask pattern is our original design and we guarantee to use non-toxic dyes and no added chemicals. After testing, our sleep mask has a light blocking rate of greater than 99%, making it a good sleep aid for those who have difficulty falling asleep.