J131 - M Thermal Lined Duck Active Jac Carhartt's duck active jac is built with 12-ounce, firm-hand, 100% ring-spun cotton duck with a 100% polyester thermal lining for on-the-job warmth. It includes a thermal-lined hood, and its rib-knit cuffs and waist work to keep out the cold. The jacket also includes two large hand-warmer pockets and two convenient inside pockets. Main seams are triple-stitched.*12-ounce, heavyweight firm-hand, 100% ring-spun cotton duck *100% polyester thermal lining *Attached thermal-lined hood