Enza Costa Silk Knit Rib Sleeveless Mockneck in Green. - size L (also in M, S, XS) Enza Costa Silk Knit Rib Sleeveless Mockneck in Green. - size L (also in M, S, XS) 87% viscose 10% silk 3% lycra. Made in USA. Machine wash. Mockneck styling. Ribbed jersey fabric. ENZA-WS1090. SRS3908. 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