About the silk sleeping cap Every night we toss and turn against abrasive, absorbent cotton pillowcases. Inspired by the tradition of hair wrapping, silk sleeping caps protect your hair in a soft silk cocoon while you sleep. ✓ No frizz or bed head. ✓ No more split ends. ✓ Natural hair oil dispersion from roots to tips ✓ Baby hair protection and growth encouragement. Reversible design made with a single layer of 100% pure mulberry silk: breathable and lightweight to suit all seasons.