Model No. OJ3828-M Warmth Rating Earned: Level 1 - Warm Engineered For Low Warmth in Cooler Conditions. See Technology section below for more details. The Carhartt Detroit Jacket built a reputation for toughness on the backs of warehouse workers, farmhands, and ranchers across America. This men's jacket is made of cotton duck that's rugged and durable. It has a warm blanket lining down the body with smooth quilted nylon through the sleeves. The droptail hem provides extra coverage but leaves enough room for your tool belt.