What Our Gearhead(R) Experts Are Saying:"I run hot when I move, and the R1 Air is my go-to midlayer for skin tracks and alpine starts. It's super breathable, dries fast, and doesn't feel swampy under a shell. I also love the deep zip-perfect for dumping heat."We love a layer that works as hard as we do, and the R1 Air Zip-Neck Top delivers across the board. Designed by Patagonia with high-output pursuits in mind, this piece keeps us warm without overheating when we're climbing, skinning, or hauling gear uphill. The 100% recycled jacquard fleece fabric feels light and breathable, even when layered under a shell, and the hollow-core yarns trap warmth efficiently while wicking away sweat. The slim fit sits comfortably under packs and harnesses, and that half-zip makes a huge difference when temps rise mid-climb. From alpine missions to shoulder-season trail runs, the R1 Air adapts effortlessly. Bluesign(R)-approved and Fair Trade Certified(TM), it's a performance layer with low impact and maximum versatility.