True Friends Don't Let Their Friends Sleep on Cotton - Cotton absorbs moisture and can dry out skin. Silk sleep masks are less absorbent and are designed to be gentle on delicate facial skin. .Anti-aging - In lab tests, silk has been shown to absorb significantly less face cream than cotton, helping to keep your skin's moisture and valuable facial products where they belong: on your face. Compared to commonly available cotton pillowcases with a thread count of 220-360. .Anti-wrinkle sleep - silk has been shown to reduce friction, allow skin to glide across the pillow, and can reduce pressure on wrinkled skin, including the delicate areas around your eyes. .The silk difference - pure silk products are made using silk. Specially ordered and manufactured to our exacting standards, silk has been developed and refined for over a decade to provide the ultimate combination of shine, thickness, softness, and durability.