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material composition: 100% mulberry silk lining fabric: 100% mulberry silk thickness: 23 m/m (m/m is not millimeter, it's the unit of thickness of silk fabric mome, 1 m/m = 4.3056 g / square meter) why choose silk fabric? 1, in recent years, after scientific research, people have found that silk fabrics have good health and treatment functions; 2, silk, which is a protein fiber, contains 18 kinds of amino acids beneficial to the human body, which can help the skin maintain the metabolism of