Quince Washable Stretch Silk Blouse, Black, S Like new Crafted from 90% mulberry silk for luxe feel, and 10% spandex for a little stretch 19mm fabric weight for a premium drape and hand-feel This material is certified by OEKO-TEX Standard 100 (Certificate Number: SH015140381) which ensures that no hazardous substances are present https://www.quince.com/women/silk/silk-blouse