What it is: A pure silk sleep mask developed and refined over 10 years to provide the ultimate combination of shine, thickness and durability. What it does: This mask is crafted from the highest grade (6A) long-fiber mulberry silk with a thickness of 22 momme and is made with the strictest quality guidelines, including the use of nontoxic dyes. Since it's made form non-absorbent silk inside and out, it keeps your skin care products on your face