4.5 oz., 100% Ring Spun Cotton; Graphite Heather and Safety Green are 50% cotton, 50% polyester; Heather Irish Green and Heather Royal are 35% cotton, 65% polyester; RS Sport Grey is 90% cotton, 10% polyester; High stitch density for smoother printing surface; Taped neck and shoulders; Tear-away label; Double needle sleeve and bottom hems; Seamless 3/4" collar; Only size 2T sideseamed; CPSIA Tracking Label Compliant