4.3 oz.(US) 7.2 oz.(CA),100% preshrunk combed ringspun cotton, 30 singles,Heather Grey is 90/10 cotton/polyester,Heather colors are 40/60 cotton/polyester,Heather Graphite is 50/50 cotton/polyester,High stitch density for smoother printing surface,Shoulder-to-shoulder taping and seamed collar,Double-needle sleeves and bottom hems,TrackMyT� label in bottom hem can be traced on TrackyMyT.com,Oeko-Tex� Standard 100 Certified,TearAway� label