You've now found the staple t-shirt of your wardrobe. It's made of a thicker, heavier cotton, but it's still soft and comfy. And 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/y² (153 g/m²) Pre-shrunk Shoulder-to-shoulder taping Quarter-turned to avoid crease down the center