From the manufacturer: We're all about upgrading the essentials. This classic tank is made from washable silk, with a bit of stretch for the perfect fit. Effortless. A-line. No dry cleaning runs needed. Perfect for layering at the office or days lounging at home. Plus, silk fiber contains 18 kinds of amino acids that make it amazing for skin nourishment, hypo-allergenic, and naturally thermoregulating to help maintain body temperature. DETAILS SIZE & FIT CARE 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 Light colors are lined for your comfort This material is certified by OEKO-TEX Standard 100 (Certificate Number: SH050127759) which ensures that no hazardous substances are present Made with care in China