The Patagonia Men's Classic Retro-X® Fleece Vest features a soft, windproof membrane bonded between a thick and fuzzy outer layer of quarter pile sherpa fleece and an interior, moisture-wicking, highly air-permeable mesh lining. The resulting fabric sandwich traps heat, blocks wind and feels smooth and comfortable against the skin. The zippered chest pocket, collar and wind flap are made of nylon with a weather-shedding DWR (durable water repellent) finish. The zippered side handwarmer pockets have a brushed-polyester mesh lining for extra warmth and a smooth feel. Treated with HeiQ® Fresh durable odor control, the Retro-X will keep you welcome among friends at the end of the day.