The Patagonia Capilene Midweight Zip Neck 44455 shirt works as an under layer as well as a versatile independent piece. It is made from a smooth, breathable, and moisture-wicking Polartec Power Grid fabric, which provides crease-free layering. The long center-front zip closure of the shirt is backed by kissing welts, offering low-bulk comfort. This shirt also has offset shoulder and flatlock seams, which minimize discomfort and chafing. Its underarms are fully gusseted, facilitating ease of movement. Equipped with elastic thumb loops at the openings, the sleeves of the shirt stay in place and cover your arms sufficiently. Its lining is made from Capilene Midweight fabric for ventilated warmth retention.