100% healthy mulberry silk: warm in winter and cool in summer, enjoy your sleep and prevent hair loss. Comes with a small piece of fabric so you can check it is 100% silk. One size fits all head sizes: 60-100cm, with a nice elastic ribbon at the back to keep it on your head all night. Multifunctional: It protects your hair against dryness caused by friction between your hair and pillowcases. Retains hair's natural moisture and shine while you sleep. It is suitable for curly or wavy hair, long hair, wigs and so on. The cap keeps your hair pulled back and won't cause headaches like tight ponytails and buns can. A perfect gift for Valentine's Day, Anniversary, Christmas, etc. Easy to care for: hand wash recommended. Avoid drying silk in direct sunlight. Prolonged exposure may cause damage or discoloration.