Blue Mulberry Silk Sleep Hair Cap Bonnet Cover for Adults Unisex Size: 55cm = 21.7 Inches/ Large One Size only but can fit head sizes 21.7 inches to 38 inches Color: navy Blue Fabric: 100% Mulberry Silk, 22 Momme 6A Grade It is very soft and comfortable, protects your hair from breakage. It helps you preserve the natural moisture of your hair.  The size is best for long, thick hair. {How to use it} • We suggest you try twisting your hair up into a bun and then put the cap over your head.