Patagonia's Men's Capilene Midweight Bottoms are a versatile and eco-friendly polyester baselayer that has become a classic. The soft and smooth exterior makes for easy layering, while the hollow-core yarns and diamond-grid back work together to keep you warm and dry quickly. These bottoms also feature HeiQ® Fresh durable odor control to keep you feeling fresh. Not just for fly fishermen, they're perfect for any outdoor activity.