The Twin Lakes Short Sleeve Sport Shirt by Filson is a warm-weather essential perfect for all kinds of outdoor activities, whether it's fishing along streams, hiking among alpine lakes or when you're aboard your skiff in the waves. The Twin Lakes is slightly stretchy to ensure maximum freedom of movement. COOLMAX® in the cotton blend wicks moisture away from the skin, dries quickly and blocks harmful UV rays. Chest pockets have a buttoned flap for added security, while the left side of the garment features a storage pocket with compartment to keep tools handy. Woven eyelets under the arms and at the bottom of the pockets increase the garment's ventilation and breathability.