From Filson, the Twin Lakes Short Sleeve Sport Shirt is perfect for warm-weather activities like fishing in desert streams, hiking to alpine lakes, or  poling across tide flats. Its fabric includes a touch of stretch for easy movement, while the COOLMAX cotton blend wicks moisture, dries quickly, and offers UPF 20+ sun protection. Button-flap chest pockets secure your essentials, and a slotted tool patch on the left side keeps gear within reach. Ventilation eyelets under the arms and at pocket bottoms improve airflow and drainage. Features a button-front closure and spread collar for a comfortable fit.