4.5 oz., 100% ringspun cotton; Sport Grey is 90/10; Dark Heather, Heather (Irish Green & Purple) are 65/35; Deluxe 30 singles Softstyle? yarns; Mitered V-neck; Double-needle stitched sleeves and bottom hem; Sport Grey is 90/10; Dark Heather, Heather (Irish Green & Purple) are 65/35; Seamless double-needle collar; Taped neck and shoulders; 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