Patagonia Capilene Thermal Weight Zip-Neck Product Description Built for colder days, the Patagonia Capilene Thermal Weight Zip-Neck works well as a basic underlayer. Made from a Polartec Power Grid fabric, it is breathable, moisture-wicking, and stretchable. The Polygiene treatment of the fabric helps control odor at all times. With flatlocked seams and gusseted underarms, this shirt lets you move about freely. Its sleeves feature elastic thumb loops at their openings, holding them in place and giving you maximum coverage. The long center-front zipper of the shirt is backed by kissing welts for unmatched comfort. With a Capilene Thermal Weight micro-grid lining, this shirt keeps you warm.