Carhartt Mens DST Relaxed Straight Leg Flannel Lined Jean. These relaxed fit jeans are made from heavyweight 15-ounce 100 percent cotton denim fabric, and are lined with 100 percent cotton flannel. The waistline rides on your natural waist in these blue jeans with roomy relaxed seat and thigh. There are two reinforced back pockets, and the legs of these straight leg jeans fit easily over boots-with a 17.5 inch leg opening. These lined pants feel like you``re still under the blankets.