6 oz., 100% USA cotton; Sport Grey is 90/10; Heathers and Safety colors are 50/50; Made with sustainably and fairly grown USA cotton; Taped shoulder-to-shoulder; Double-needle sleeve and bottom hem; Seamless double needle 5/8" collar; Sideseamed; Classic fit; 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