Enza Costa Supima Rib Sheath Tank in Black. - size M (also in L, S, XL, XS) Enza Costa Supima Rib Sheath Tank in Black. - size M (also in L, S, XL, XS) 90% supima cotton 10% spandex. Made in USA. Machine wash. Thick ribbed jersey fabric. ENZA-WS1177. 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. Shop the latest in fashion from Enza Costa