slip Pure Silk Sleep Mask in Neutral slip Pure Silk Sleep Mask is made using slipsilk, a patented fabric that has been developed and refined over the course of ten years to provide the ultimate combination of shine, thickness, softness and durability. Silk fibers are significantly less absorbent than many other fibers, meaning they help your skin's moisture and face and hair products stay where they belong - on your face and hair. slipsilk helps to reduce friction as well, allowing skin and hair to glide along the fabric and evade the damaging effects of pulling, tangling and creasing.. Made from 100% highest grade (6A) long fiber mulberry silk with a thickness of 22 momme. Non-toxic dyes. Silk covered elastic band. Hand wash cold. TIPS:</b> To preserve the quality of your silk pillow, we recommend you use a pH neutral liquid detergent.. SLPF-UA9. 853218006117. About the designer: