Enza Costa Supima Rib Sheath Tank in White. Size M, S, XL, XS. 90% supima cotton 10% spandex. Made in USA. Machine wash. STSR3947. Designed to transform everyday basics into luxury essentials, Enza Costa's unique brand of minimalist, modern clothing is crafted with featherweight blends of sumptuous supima cotton, cashmere and silk.