Why switch to a Slip Pure Silk Pillowcase? Real results, real benefits in just 4 nights! Clinically shown* to visibly improve the appearance of fine lines, skin hydration, skin texture and smoothness and skin radiance, luminosity or brightness. More than 95% of users agreed sleep creases, sleep lines and sleep wrinkles were fewer and less noticeable.* Dermatologist recommended.** Slip Pure Silk products are made using slipsilk, developed and refined for more than ten years to provide the ultimate combination of shine, thickness, softness and durability.