Amazon.com: Miwen Silk Sleep Cap, Pure Mulberry Silk Turban 。Black Mulberry Silk Sleep Hair Cap Bonnet Cover for Adults Unisex Size: 55cm = 21.7 Inches/ Large One Size, fit head sizes 21.7 inches to 38 inches Color: Black {about the item} Fabric: 100% Mulberry Silk, 22 Momme 6A Grade It protects your hair from breakage, helps you preserve the natural moisture of your hair.  Size is best for long, thick hair. {how} • We suggest you try twisting your hair up into a bun (make sure all your hair is tucked in) and then put the cap over your head.