Work Shirt Made of 6.75-ounce, 100-percent cotton jersey, Carhartt's long-sleeve pocket t-shirt makes for perfect workwear layered or worn alone. It features a crew neck with a generous left chest pocket and side-seamed construction to minimize twisting. Ash fiber content is 99 percent / 1 percent polyester. Heather gray fiber content is 90 percent cotton / 10 percent polyester.