Authentic Thermal is the workhorse of the Terrarmar women's line. This soft versatile bottom will protect you while skiing on a cold winters day or keep you comfortable shoveling snow in the driveway. The two-ply midweight microfiber fabric traps plenty of air to keep you warm, dry and comfortable throughout the day. If you are a busy lady you don't want to worry about your layers. Authentic Thermal gets it done.