The finest mountain days merge elegance and efficiency. Patagonia's R1® Pullover maintains a similar focus, with a high/low interior grid polyester/spandex fabric (Polartec® Power Grid®) that stretches, breathes, moves moisture and insulates—made exclusively for Patagonia to be both light and breathable. Its technical fit accommodates light underlayers or works as a stand-alone top, and it squashes down to practically nothing in your pack. Simple cuffs stay comfortable against the wrists (the cuffs and hem are finished with ultrasoft binding material); minimalist zippers reduce bulk; and a soft, kissing-welt zipper garage at the chin offers next-to-skin comfort. With a smooth, microfiber face for easy layering, redesigned offset shoulder seams for pack-wearing comfort, a zippered left-chest pocket and Polygiene® permanent odor control.