ZIMASILK Adjustable Mulberry Silk Sleep Mask The size is very large 4.5x8.5 inches, it just molds around your face, but it is big enough not to leak light. It have an adjustable wide elastic band. will never go loose and won't be uncomfortable. Upgrade design Quality fabric: 100% high-quality 19mm mulberry silk on both sides. Free adjustable headband:Upgrade headband with adjustment buckle, easily adjust as you like. Silk bands:100% silk wrapping cover bands,perfect for your smooth hair and skins. Why Silk: Natural mulberry silk is of many wonderful skin healing and health promoting properties. It is also called the "queen of natural fiber". Modern science has proven that it is 98% of protein containing 18 amino acids. It is the oldest natural fiber been used as surgical internal sewing thread, and it works a wonder for people with burnt skin and eczema on clinical trials. Zimasilk sleep mask benefits Not only care and breathable for your eyes,but also more gentle and care for your smooth hair and skins.It is your best sleeping assistant! Silk Care Instruction Hand wash, or machine wash cold in delicate cycle, separately from other items. Hang dry, or cold air machine dry. Please do not expose the silk sleep mask under the strong sun.