Astroman Long-Sleeve Sun Shirt - Fatigue Plaid/Green (Medium) Button-up shirt is suited for mild-weather hiking, fishing, and relaxing Synthetic construction is highly breathable for steaming hot days 50+ UPF sun protection defends from the sun’s harmful rays Inner back yoke helps keep air flowing when you're reeling a fish in Integrated chest pocket stashes snacks, tools, and essentials Regular fit supplies optimal comfort and range of motion 85% nylon, 15% spandex