These racerback tank tops are made with a high-stitch density for a smoother and softer style. They have banded neck and arm holes a tearaway label and a double-needle stitched bottom hem ensuring high quality production. They are made with a semi-fitted contoured silhouette with side seams to achieve the ultimate comfort level of apparel. All of these tank tops are 100% cotton except for the following: graphite heather is 50/50 cotton/polyester. Heather Irish green heather purple and heather red are 35/65 cotton/polyester. And sport grey is 90/10 cotton/polyester. Order one size up for a roomier fit. See sizing chart.