The Patagonia Women's Capilene Thermal Weight Zip-Neck Top is a must-have for comfort and warmth when there's a chill in the air. This Capilene® baselayer shirt features a proprietary fabric that is breathable with odor control and moisture-wicking features. The slim fit makes it easy to wear alone or under other garments to stay warm. The offset shoulder seams help to minimize chafing when wearing a backpack. You won't compromise on your range of motion with the full underarm gussets. Use the deep front zipper to take this top off or put it on with no difficulty.