Bestseller Chemistry Sales T-Shirt | Drug Development HumorYou've now found the staple t shirt of your wardrobe. It's made of 100% ring spun cotton and is soft and comfy. The double stitching on the neckline and sleeves add more durability to what is sure to be a favorite! 100% ring spun cotton Sport Grey is 90% ring spun cotton, 10% polyester Dark Heather is 65% polyester, 35% cotton 4. 5 oz yd (153 g m) Shoulder to shoulder taping Quarter turned to avoid crease down the center Blank product sourced from