You reach for this one when you want to move fast on mountain trails in warm weather. Balancing wind protection and light water repellency with enhanced mobility and breathability, the hybrid construction places Fortius Air 50 at the front, shoulder, and tops of the sleeves for stretch. Under the arms and on the back, Fortius Air 20 stretch mesh elevates airflow. The minimalist design sheds grams and includes a low-profile adjustable hood for added protection.