The Eddie Bauer Women's Expedition Weight Thermal Bottom is a reliable and durable option for women in need of heavy-duty flannel base layer bottoms. These bottoms are made from a blend of polyester and spandex, which offers excellent warmth and flexibility. The moisture-wicking fabric keeps you dry and comfortable, while the flatlock seams minimize chafing and irritation. With a wide waistband and a relaxed fit, these bottoms provide a comfortable and secure fit for extreme cold weather conditions.