4.5 oz. 100% preshrunk ringspun cotton jersey; Sport Grey and Antique colors: 90% cotton, 10% polyester; Graphite Heather: 50% cotton, 50% polyester; All other Heather colors: 65% polyester, 35% cotton; Seamless double-needle 3/4" collar; Taped neck and shoulders; Rolled forward shoulder; Double-needle sleeve and bottom hem; Tubular fit for minimal torque; 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.