This pillowcase is made of natural silk, which is soft, breathable, and comfortable. It will avoid your hair from the electrostatic interface. Silk pillowcases help prevent hair from becoming knotted while you're sleeping. The pillowcases are suitable for any season, they can coordinate with your living room, bedroom, sofa, or bed. The hidden zipper allows easy insertion and removal of pillow inserts and keeps the pillow in place.