5.1 oz./yd*, 100% soft spun cotton, 20 singles; Athletic Heather is 90% cotton, 10% polyester; Charcoal Heather, Graphite Heather, Navy Heather, Red Heatherm Royal Heather and Safety Green are 50% cotton, 50% polyester; Made with sustainably and fairly grown US cotton; Set-in rib collar with shoulder-to-shoulder taping; Double-needle sleeve and bottom hem; Preshrunk; Tear away label; Alstyle's manufacturing process utilizes 45% renewable energy; Alstyle?, through Gildan?s Community Investment Program, supports education, the environment, humanitarian aid and active living in the communities we do business in