Carhartt Women's Base Force Cold Weather Bottom is a highly rated option for women's flannel base layer bottoms. These bottoms are made from a blend of polyester and spandex, which provides a comfortable and stretchy fit. The fabric is designed to wick away moisture and fight odor, keeping you dry and fresh throughout the day. The bottoms have a mid-weight thickness, making them suitable for cold weather activities. With their durable construction and excellent performance, these base layer bottoms are a popular choice among outdoor enthusiasts.