The fabric in this new thermal bottom, which is 30% heavier than most other thermals, means you'll stay warm no matter how long you remain outside to finish the job. Made from premium, 9.5-ounce cotton, this knit features a double elastic waist that provides great ease of movement, flat-lock stitched seams for durability, and low shrinkage for a more consistent fit. The heavyweight fabric traps body heat in for warmth, and the comfortable rib-knit leg openings ensure that cold air is locked out. This job-tested thermal is hard working, rugged and all Carhartt.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.