Extremely light and packable, Patagonia have built the technical R1 Air fleece with hollow core yarns and a lofted zig-zag texture to trap air, move moisture and breathe for exceptional warmth without weight during high-exertion, non-stop activities in cold conditions. Made from recycled polyester with hollow-core construction, R1 Air has a clean, athletic design for easy layering. Light, airy and minimally designed, it feels soft on the skin and can be worn as a stand-alone top when conditions permit. Details include a zip-neck design for easy venting, off-shoulder seams that sit comfortably under your pack straps, a simple cuff and hem design with a quick-drying binding that adds wrist comfort, a left-chest pocket for stashing your essentials and HeiQ Fresh durable odour control so you stay welcome among friends at the end of the day.