The Men's Patagonia R1 Thermal Bottom is a technical fleece pant for adventuring through cold weather. These super stretchy pant allows for unrestricted movement as you move up, down, and around the mountain, with a microgrid interior that is soft, warm, and breathable for your active pursuits. The smooth outer face fabric is durable for shedding light snow and wind, helping maintain comfort when the weather turns. The tapered leg and overall slim fit won't get caught on various gear and allow for layering when the weather worsens.