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 nonabsorbent silk inside and out, it keeps your skin-care products on your face where they belong. How to use: When washing the pillowcase, hand wash. Do not tumble dry or bleach. Use a pH-neutral liquid detergent and line dry in the shade. Iron or steam on low heat. 100% silk Hand wash, line dry Hand wash at 30ºC/86ºF, line dry Imported