R1 fleece still sets the bar for alpine efficiency. Made with Polartec Power Grid polyester, a Patagonia exclusive, it'stretches, traps heat and compresses to practically nothing's A beautiful line, your climbing partner, rope and a rack: The greatest days merge elegance and efficiency. Our R1 Pullover maintains a similar focus, with a durable, finely tuned high/low interior grid polyester fabric (Polartec Power Grid) that warms, stretches, moves moisture and insulatesrecently redesigned exclusively for Patagonia to be even lighter and more breathable. Its technical fit accommodates light underlayers or works as a stand-alone top, and it'squashes down to practically nothing'sin your pack. With simple cuffs; a smooth, microfiber face for easy layering; raglan sleeves for pack-wearing comfort; a zippered chest pocket; and Polygiene permanent odor control. Exclusive to Patagonia, this Polartec Power Grid fab