6 oz., 100% USA cotton, 18 singles; Heather Grey is 90% USA cotton/10% polyester; Charcoal Grey, Safety Green, and Lime are 50% USA cotton/50% polyester; Shoulder-to-shoulder neck tape; 1" double-needle stitched sleeve and bottom hems; Tear away label; 7/8" Seamless non-topstitched collar; Quarter-turned to eliminate center crease; Forward-thrusted shoulder seam for comfortable neck fit; Classic fit