Natural performance for the mountains. The long-sleeved X-Alp Performance Wool 115 Trail Running Shirt is a running shirt like no other: it is lighter, more durable, and dries faster than conventional merino clothing. This stylish striped shirt with thumb loops is made from performance wool developed by Nuyarn – a wool blend that exhibits very similar performance characteristics to wool. It naturally regulates temperature, cooling when it's warm and warming when it's cold. Additionally, it is naturally antimicrobial, meaning it resists odors. The functional material made from mulesing-free merino wool dries five times faster than regular merino clothing – perfect for longer trail runs and ideal under a vest or jacket. Enjoy lightweight and high-performance wool – so natural that you won't want to wear anything else.