5.3 oz., 100% USA cotton; Ash Grey is 99% cotton, 1% polyester; Sport Grey is 90% cotton, 10% polyester; Made with sustainably and fairly grown USA cotton; Double-needle stitching throughout; Seamless rib at neck; Taped shoulder-to-shoulder; Ribbed cuffs; 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