Warm, stretchy, and always breathable enough for your active cool-weather pursuits—there's a reason that the Patagonia R1 Fleece 1/2-Zip Pullover has been a trusted mainstay of Patagonia's lineup for the past 20 years. This ultra-versatile midlayer will join you everywhere, from fall desert climbing sessions to spring backpacking trips and early morning ski tours. It uses a Patagonia-exclusive Polartec Power Grid fleece, which uses a special grid design to enhance airflow and moisture management when you're working hard in falling temps. It's also infused with spandex, offering an easy stretch that'll keep 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. Plus, it's got a smooth exterior face that layers easily under a shell when your travels take you to windy peaks and rainy climates.