The REI Co-op Women's Midweight Base Layer Tights are a popular choice for women seeking versatile and affordable flannel base layer bottoms. These tights are made from a blend of polyester and spandex, which offers excellent stretch 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 slim fit design, these tights provide a comfortable and secure fit for various activities.