100% healthy mulberry silk: warm in winter and cool in summer, enjoy sleep and prevent hair loss. A small piece of fabric is included so you can check if it's 100% silk.One Size Fits All Head Shapes: Adjustable size with a nice elastic on the back to keep it on your head overnight.Multifunctional: It protects your hair from dryness caused by friction between the hair and the pillowcase. Maintains hair's natural moisture and shine during sleep. Perfect for curly or curly hair, long hair, wigs, etc. Beanies pull hair back without the headaches of tight ponytails and buns.Easy to maintain: Hand wash recommended. Avoid drying silk in direct sunlight. Prolonged exposure may cause damage or discoloration.