Quince women's washable silk button down with stretch. 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 Hand wash or machine wash cold in delicate or gentle cycle with similar colors. Turn inside out, in garment bag. Line dry. Cool iron on reverse side. Do not bleach. Do not tumble dry. Dry clean if needed.