6 oz., 100% USA cotton; Antique (Cherry Red, Irish Green, Royal) and Sport Grey are 90/10; Dark Heather, Heather (Cardinal, Indigo, Navy, Sapphire) are 50/50; Safety (Green, Pink and Orange) are 50/50; Ash Grey is 90/10; Made with sustainably and fairly grown USA cotton; Taped shoulder-to-shoulder; Double-needle stitching throughout; Seamless collar; Tear away label; Gildan's manufacturing process utilizes 45% renewable energy; Gildan’s Community Investment Program supports education, the environment, humanitarian aid and active living in the communities we do business in