We pull the Smartwool IntraKnit Merino 200 Crew Top over our heads when the temperature starts to drop but we don't want to miss our planned trail run. Merino wool regulates our temp for warm, breathable comfort, while also fighting off funky smells thanks to its natural odor-resistant properties. From backcountry tours to high-alpine trails, this top keeps us cool and comfortable on those wintry days spent adventuring.