anti aging, anti sleep crease, anti bed head™ pure silk pillowcase. The slipsilk(TM) difference - 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. Anti Aging - In laboratory testing, slipsilk™ pillowcases were shown to absorb significantly less face cream than cotton pillowcases*, so they can help keep your skin's moisture and valuable face and hair products where they belong, on your face and hair. Slipsilk™ was also shown to create 43% less friction on average*, which can reduce stretching and tugging on delicate facial skin. Anti Sleep Crease - Slipsilk™ has been shown to reduce friction by 43% on average*, allowing skin to glide along the pillow, which can reduce pressure on creased skin. Anti Bed Head - Ordinary pillowcases can cause hair tangling during the night. In laboratory testing, slipsilk™ has been shown to reduce friction by 43% on average*.*Compared to widely-available cotton pillowcases with a 220-360 thread count.