The Men's Patagonia Capilene Thermal Weight Zip-Neck Top is a base layer for cold weather adventures. The Polartec Power Grid fabric is enhanced with HeiQ Pure odor control, offering a smooth outer surface for easy layering and an open-grid inner pattern that delivers excellent warmth, breathability, and moisture-wicking capabilities. Designed for comfort in active use, it includes a self-fabric collar with internal neck tape and a locker loop, offset shoulder seams to reduce chafing under pack straps, and a long center-front zipper with kissing welts for low-bulk ventilation. Full underarm gussets ensure unrestricted movement, while elastic thumb loops provide secure hand coverage, and flatlock seams along with a drop-tail hem add to overall comfort and coverage.