The R1® Jacket’s popularity among backcountry athletes was inevitable: it stretches, breathes, wicks and warms with ultimate efficiency. And the full-zip front makes it super versatile, from a midlayer in winter to a lightweight jacket on early fall mornings and alpine summer evenings. Plus, the fabric has never been better: We worked with Polartec to fine-tune the high/low interior grid polyester (Polartec® Power Dry®), making it more breathable and compressible, with an improved feel and durability, while still maintaining its warmth. Two zippered handwarmer pockets sit above the harness line, and offset shoulder seams steer clear of pack straps. 6.8 oz Polartec® Power Grid® fabric.