65% poly/35% viscose 30 singles 3.7 ounce flowy muscle tank. Low cut armhole. Curved bottom hem. Side-seamed. Relaxed, drapey fit. (Ath. Heather - 52% poly/48% viscose. Marble colors - 91% poly/9% combed and ring-spun cotton 40 singles 3.5 ounce. Slub colors - 50% poly/37.5% combed and ring-spun cotton/12.5% rayon 30 singles 4 ounce.)