slip Pure Silk Sleep Mask in Pink Marble. slip Pure Silk Sleep Mask in Pink Marble. We spend a third of our lives in bed. So what could be better than sleeping on a slip anti-aging, anti-sleep crease, anti-bed head pure silk pillowcase? Wearing a luxurious slip Pure Silk Sleep Mask at the same time, so your beauty sleep isn't interrupted. Specially-commissioned and made to slip's exacting standards, slipsilk has been developed and refined for over ten years to provide the ultimate combination of shine, thickness, softness and durability.. In Pink Marble. Made from 100% highest grade (6A) long fiber mulberry silk with a thickness of 22 momme. Non-toxic dyes. Silk covered elastic band. Use up to eight hours daily for maximum results. Hand wash cold. Use a pH neutral liquid detergent and/or fabric softener. SLIP-WU11. 850004304389.