The Patagonia Capilene® 2 Lightweight Zip Neck top for Women features a 1/2 length zip neck for added adjustment during times of aerobic activity. Constructed of Patagonia's most breathable Capilene® fabric, the Patagonia Capilene® 2 Lightweight Zip Neck is a great stand alone piece for running and hiking or as a baselayer for skiing and snowman building.