Sleep Mask - FeaturesIncludes slipsilk covered elastic band100% pure silk filler and internal linerNon-toxic dyesMade from 100% highest grade (6A) long fiber mulberry silk with a thickness of 22 mommeResearch Results*Compared to widely available cotton pillowcases with a 220-360 thread countIn laboratory testing, slipsilk was shown to create 43% less friction, on average, versus cotton pillowcases*Slip pure silk products are made using slipsilk, developed and refined for over ten years to provide the ultimate combination of shine, thickness, softness and durability - Sleep Mask