Exceptionally lightweight and easy to pack, Patagonia's technical R1 Air fleece is designed with hollow core yarns and a lofted zig-zag texture. This construction traps air, manages moisture, and offers breathability, providing remarkable warmth without added weight during high-intensity, continuous activities in cold weather. Perfect for intense activities, it features a half zip for temperature regulation and off-shoulder seams to minimise chafing when carrying a backpack. Patagonia Women's R1 Air Zip Neck - Red | George Fisher