The K231 is a men's heavyweight, long-sleeve cotton t-shirt cut generously for a roomy, loose fit. Most colors use 6.75-ounce, 100% cotton jersey knit, while heathered colors like Heather Gray use a 90% cotton/10% polyester blend. It features a rib-knit crewneck and cuffs that hold their shape over repeated wear, side-seamed construction that minimizes twisting, and a tagless neck label. The Carhartt name/logo is displayed on the sleeve, and the shirt is offered across a range of solid and heathered colors including Black, Carbon Heather, Dusty Olive, Navy, and Port.