Colors S-XL - Ladies' 2x1 rib racerback longer length tank made of 5.8 oz, 100% combed and ringspun cotton. 30 singles. Super soft 2x1 rib knit. The racerback tank's longer body lengthens lines while the 2x1 rib makes for a sleek and sporty look. Athletic Heather is 90% combed and ringspun cotton, 10% polyester.