100% Silk Bonnet Silk Bonnet is  Breathable & Adjustable.  Silk Hair  Night Cap to protect fragile hair and promote hair growth. Made of premium 6A grade, 100% 19 momme mulberry silk for a smooth, comfortable feel. Thin, lightweight, and breathable to prevent sweating and overheating. Extra large size with adjustable tie band to fit all adult head sizes and hair types. Stays put on your head all night thanks to elastic tie bands - keeps hair protected. Locks in moisture, reduces friction and breakage for shiny, hydrated hair with less tangles