The best-selling Vigor Collection is guaranteed to help you layer intuitively and effectively for cold weather adventures. Thermo-regulating ActiveTemp™ works hand-in-hand with Vigor's grid fleece fabric, which wicks sweat and allows total breathability when you're gunning it uphill. Whether you're wearing it as a midlayer for sub-freezing days, or an outer layer for mild temperatures, take on each adventure with Vigor. Learn more about ActiveTemp™ technology right here. [https://www.outdoorresearch.com/blog/article/get-to-know-thermo-regulating-technology-activetemp]