Enza Costa Silk Knit Boat Neck Top in Black. - size L (also in M, S, XL, XS) Enza Costa Silk Knit Boat Neck Top in Black. - size L (also in M, S, XL, XS) 87% viscose 10% silk 3% lycra. Made in USA. Machine wash. Ribbed jersey fabric with boatneck neckline. ENZA-WS1109. SRS3910. 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