The Smartwool Women's Intraknit Thermal Merino Base Layer Colorblock 1/4 Zip Shirt is a performance thermal base layer designed for high-energy adventures in cool to cold weather. Built with advanced Intraknit technology, it seamlessly integrates insulation, ventilation, and articulation to help her stay comfortable through changing conditions. The Merino wool blend naturally manages moisture, regulates body temperature, and resists odors while strategically placed mesh zones maximize breathability during intense activity. A slim fit with 3D body mapping delivers near-custom comfort and unrestricted mobility for skiing, hiking, running, and winter training. Finished with a convenient 1/4 zip and eye-catching colorblock styling, this base layer combines technical performance with modern outdoor style.