5.3 oz./yd² (US), 8.8 oz/L yd (CA), 100% cotton, 20 singles; Sport Grey is 90/10 cotton/polyester; Graphite Heather, Neon Green & Safety Pink are 50/50 cotton/polyester; Classic fit; Bound neck and armholes; Side seams; Tear away label; Proud member of the U.S. Cotton Trust Protocol; Made with OEKO-TEX certified low-impact dyes