When both the altitude and temperature are bound to switch between high and low throughout the day, we turn to the Norrona Trollveggen Powerstretch Pro Jacket for flexible and comfortable insulation during alpine adventures. The unique wool blend under the arms and in the back does an exceptional job of thermal-regulation, odor-reduction, and keeping you warm even when wet, while the highly durable Polartec Powerstretch Pro withstands all the wear and tear you can throw at it and dries quickly all the while. It has a snug and ergonomic fit to maximize mobility in steep and difficult terrain, and the cuffs boast thumbholes to prevent exposing your skin to the cold and snowy.