Sleep Mask - SLEEP MASK BLACKFeatures100% pure silk filler and internal linerIncludes slipsilk covered elastic bandMade from 100% highest grade (6A) long fiber mulberry silk with a thickness of 22 mommeNon-toxic dyesResearch ResultsSlip pure silk products are made using slipsilk, developed and refined for over ten years to provide the ultimate combination of shine, thickness, softness and durabilityIn laboratory testing, slipsilk was shown to create 43% less friction, on average, versus cotton pillowcases**Compared to widely available cotton pillowcases with a 220-360 thread count - Sleep Mask