What it is: A sleep mask developed and refined over years to provide the ultimate combination of shine, thickness and durability.What it does: It's 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. This mask is pure silk inside and out, from its pure silk filler, silk internal liner and silk-covered elastic band. 100% silk Hand wash, line dry Imported