Patagonia's R1 Air Crew Top is a loyal member of the brand's R1 collection, featuring hollow-core fleece fibers that offer more breathability without sacrificing an ounce of warmth. Offset shoulder seams increase comfort when you're carrying a pack, and the zigzag weave is remarkably soft for next-to-skin support. Store snacks, tech, or your favorite outdoor essentials in the zippered chest pocket.