BlackYak built the Men's Madura Shirt for high-output activities in the summertime like climbing and hiking. Its stretchy fabric ensures freedom of movement, wicks moisture, and dries quickly to keep you comfy when you work up a sweat. There are laser perforations that amplify airflow for sufficient ventilation in warmer weather. Active Stitch seams not only provide a flat, smooth feel, but also add stretch for assured freedom of movement.