Wrinkle resistant Coolmax Extreme Ripstop fabric is durable, and provides UPF 30+ protection from the sun. The specially engineered Dupont fibers used in Coolmax also wick away perspiration to keep you cooler in summer, and warmer than cotton in the winter. Hidden vents keep the air circulating and the temperature down (if worn alone). Secure document pockets are perfect for travel tickets, and a zip front pocket keeps your belongings secure. Tabs allow you to button rolled-up sleeves to keep them put, while a hidden button placket helps create a clean look. The 2.9-oz Ripstop is our lightest weight fabric - wrinkle resistant and perfect for packing down small. Wear it with a Go Everywhere Pant for travel or a Billy Goat Pant for hiking.