Slipsilk™ is 100% pure mulberry silk that is specially-commissioned and made to our exacting standards, developed and refined over ten years to provide the ultimate combination of shine, thickness, softness and durability. Slipsilk™ use the highest grade (6A) long fiber 100% pure mulberry silk, with a thickness of 22 momme and enforce the strictest quality guidelines, including non toxic dyes. CLINICALLY SHOWN TO VISIBLY IMPROVE: THE APPEARANCE OF FINE LINES SKIN HYDRATION SKIN TEXTURE AND SMOOTHNESS SKIN RADIANCE, LUMINOSITY OR BRIGHTNESS USER RESULTS: Over 96% of users would recommend a slip® pure silk pillowcase to their family and friends. Over 92% of users prefer sleeping on a slip® pure silk pillowcase over their ordinary cotton or synthetic (non-silk) satin pillowcase. Over 90% of users will be adding a slip® pure silk pillowcase to their beauty regimen. 90% of users agreed that their hair was more manageable. 90% of users agreed that they had less frizz in their hair upon waking. Over 85% of users agreed that their bed head visibly improved upon waking. Over 84% of users agreed that their skin had fewer visible lines or wrinkles. Over 80% of users agreed that their skin looked more youthful.