The Under Armour Women's ColdGear Leggings are a popular choice for women looking for a high-performance flannel base layer bottom. These leggings are made with Under Armour's ColdGear technology, which helps to keep you warm and dry in cold weather conditions. The flannel lining provides extra insulation, while the moisture-wicking fabric keeps you comfortable and dry during intense workouts. With a sleek and stylish design, these leggings are perfect for both outdoor activities and casual wear.