Slip pure silk pillowcases are designed to provide tangible results in just 4 nights. Clinically proven* to improve the appearance of fine lines, hydration, texture, and brightness of the skin. Over 95% of users noticed a reduction in sleep creases. Slipsilk significantly reduces friction, keeping skin and hair in optimal condition while you sleep. Recommended by dermatologists, it is hypoallergenic and made from a unique material developed over ten years.