The beauty secret of celebrity hairstylists, dermatologists and beauty experts. What could be better than sleeping on a slipsilk pillowcase? Wearing a luxurious slipsilk sleep mask at the same time (so your beauty sleep isn't interrupted)! Slipsilk was developed and refined for more than ten years to provide the ultimate combination of shine, thickness, softness and durability. This sleep mask made with slipsilk is designed for 8 hours of uninterrupted beauty sleep.