Neutrals - Anvil youth 5.4 oz, 100% heavyweight cotton t-shirt. 100% preshrunk heavyweight cotton. TearAway (TM) label. Double-needle stitching on neck, sleeves and bottom hem. Shoulder-to-shoulder tape. Certified Oeko-Tex (R) Standard 100. One seriously smooth operator, thanks to lots of features that do away with the poke, itch and scratch of lesser shirts. Heather Dark Gray and Moss are not Oeko-Tex (R) certified. Heather Gray is 90% cotton, 10% polyester.