Slip Pure Silk Pillowcase, King What it Does A multi award-winning anti aging, anti sleep crease, anti bed head slipsilk pillowcase. Slip is the #1 preferred brand of silk pillowcases by dermatologists for their patients, themselves and their families** The beauty secret of celebrity hairstylists, dermatologists and beauty experts. **In a survey of dermatologists in the United States conducted between 1-12 November 2021. How to Use it Use up to 8 hours da...