Blending minimalism with unconditional performance, our R1 midlayers are made for stop-and-go, cool-weather layering that keeps you warm and comfortable across the full spectrum of mountain endeavors. The Polartec Power Grid fabric - made exclusively for Patagonia - features a high/low interior grid recycled polyester/spandex blend that stretches, breathes, moves moisture and insulates. Lightweight and soft on the skin, the R1 Crew has a technical fit that accommodates underlayers yet can be worn as a stand-alone top when conditions permit; it compresses down to practically nothing in your pack. Details include a low-profile crewneck to reduce bulk when layering, simple cuffs with an ultrasoft binding for wrist comfort, raglan sleeves to allow mobility and provide comfort under pack straps, a hem slit for athletic motion and a drop-tail design that stays tucked into a harness. With HeiQ Fresh durable odor control so you stay welcome among friends at the end of the day. Fair Trade Certified sewn, which means the people who made the R1 Crew earned a premium for their labor.