A combination of favorites, this lightweight midlayer is constructed with compact weather-shedding Nano Puff insulation to protect and warm crucial areas and high-loft R2 fleece everywhere else. Patagonia revised this hybrid by remapping the PrimaLoft ONE synthetic insulation (60-g, with a recycled polyester shell) to cover the front and back torso and the tops of the arms, from shoulders to cuffs, for concentrated warmth. Meanwhile, compressible and stretchy R2 fleece insulation covers the sides, lower torso and underside of arms and breathes without restriction, enabling unrestricted pole plants on frigid ski approaches. Other improvements include a soft, wicking interior storm flap and zipper garage at the chin, stronger elasticized cuffs and hem for a better seal, and a higher collar with brushed tricot on the inner neck and chin. Harness and pack compatible, the two zippered handwarmer pockets ride high, and the full-length, reverse-coil front zipper is backed with a low-bulk wind flap and treated with a Deluge DWR (durable water repellent) finish.