An ultra light, quick drying Filson shirt that is ideal for excursions in the countryside due the ventilation details, moisture absorbing and durable qualities. The Filson Twin Lakes Sport Shirt is for your outdoor fanatics who want a shirt that you can trust and one that will last. Features Ultralight 2.8-oz. 53% polyester/47% nylon Quick-drying and breathable UPF rating of 30+ Odor Resistant Vented back yoke with mesh liner Grommets under arms for ventilation and on pockets for drainage