At the construction site or in the warehouse, cold weather won't keep you from getting the job done. These men's pants are made of washed duck for durability with a broken-in look and feel. They're lined with cotton flannel for long-lasting warmth. 12-ounce, 100% ringspun cotton duck. 4.5-ounce, 100% cotton flannel lining for comfortOur roomiest cut with a generous fit through the seat and thigh and a straight leg opening. Multiple tool and utility pockets. Left-leg hammer loop. Carhartt.