Lightweight, breathable and cut in a slim fit, the Carhartt Lightweight Thermal Knit Crewneck makes a great base layer for your Carhartt workwear. Constructed with three-needle, coverstitched main seams, it's built of 5.5-ounce, 60% cotton/40% polyester thermal textured knit. The rib-knit crewneck collar and cuffs add comfort, and the raglan sleeves enhance range of motion.