Description of Marmot Alpine S/S Shirt For inevitable hot-weather sweat-fests when traveling, hiking and climbing, the Alpine combines quick-drying, odor-deterring Cocona Polyester and nylon to guarantee simultaneous comfort and style. Features: 81% Polyester (50% Cocona® Polyester)/19% Nylon Cocona® Natural Technology Cocona Natural Technology Lightweight Natural Odor Protection Packable Quick Drying Secure Chest Pocket UPF Protection 40