The Patagonia R1 Air Crew Sweatshirt - Men's is a lightweight fleece for cold weather activity. The 100% recycled polyester jacquard fleece features hollow-core yarn and a zigzag pattern designed to wick sweat, dry fast, and remain breathable for a full day of pushing the limits outdoors. Designed for fast-moving activities through the cold and can be worn as a stand alone piece or mid layer. Seashore to the mountain top, accept the challenge.