Like every Carhartt thermal underwear product, we've designed this crew neck top for comfort, warmth and durability. Made of 100% polyester, it has anti-odor properties and Work-DryŽ technology that wicks moisture away from your body. The fleece-lined interior traps body heat and keeps you warm while the smooth, anti-pill, jersey exterior allows for easy layering. Rib-knit cuffs keep cold air out, and all seams are flat-lock stitched for added strength. The tagless neck label provides additional comfort. We've left no details out of this heavyweight workwear staple.For over 115 years, Carhartt has manufactured premium workwear known for exceptional durability, comfort, quality of construction, and fit that you can feel in the fabrics and see in the performance.