Patagonia R1 Air Vest – Men's insulation the Ultrafly 4 is our

the Ultrafly 4 is our top pick for daily training miles

Relaxed crew neck and short sleeves for all-day comfort around camp or town

Heavy-duty Weather Weave fleece with a DWR finish sheds light rain and blocks wind

and bluesign-certified for responsible manufacturing

and uneven campsite terrain

Patagonia R1 Air Vest – Men's insulation the Ultrafly 4 is ourBuilt for high output cold weather movement, the R1 Air Vest is our pick for trail runners and fast hikers who need core warmth without cooking. Hollow core recycled polyester yarns in a zigzag knit dump heat fast and dry even faster, so you stay regulated on the move. Off shoulder seams mean zero friction under a pack. Hollow core 100% recycled polyester jacquard fleece traps warmth at the core while actively venting excess heat no more stop and