Warm, stretchy, and always breathable enough for our active cool-weather pursuits--there's a reason that the R1 Fleece 1/2-Zip Pullover has been a trusted mainstay of Patagonia's lineup for the past 20 years. This ultra-versatile midlayer joins us everywhere, from fall desert climbing sessions to spring backpacking trips and early morning ski tours. It uses a Patagonia-exclusive Polartec Power Grid fleece that features a special grid design to enhance airflow and wick sweat when you're working hard in falling temps. It's also infused with spandex, offering an easy stretch that keeps any hold within reach when you're chasing sunlight on end-of-day climbs. The deep chest zipper allows for cooling ventilation when you really start to get going, while offset shoulder seams ensure comfort under pack straps on early-morning starts.