When the mountain calls and the temperature drops, the Outdoor Research Polartec 200 Half Zip Fleece delivers the warmth and durability you need for serious alpine adventures. This technical fleece mid layer combines proven Polartec 200 fleece construction with strategic woven overlays at the yoke, collar, and chest pocket—reinforcing exactly where your pack straps hit hardest during long backcountry missions. The moisture-wicking fabric breathes easily during sweaty uphills and dries fast when you stop to layer up, while 13-inch side hem zips let you adjust ventilation and add shells without the fumbling dance of removing layers. Built with 78% recycled content and bluesign-approved materials, this cold weather layering essential proves you don't have to choose between performance and environmental responsibility, making it the perfect companion for mountaineering, alpine hiking, and any high-altitude pursuit where reliable warmth meets sustainable design.