Inspired by mountaineering principles, this is the pinnacle of active insulation for high-intensity activities in challenging weather. Strategically constructed with lightweight and flexible CORDURA® Fabric , this jacket is going to give you protection when humping it up and down the mountain all day without sweating to death. The Grizzly is lined with a knitted, highly-breathable, blend of Merino and polyester around your core, yet the sides of the jacket have no lining to allow airflow. Additionally, we used CANIS Hybreath® Construction which delivers a windproof front and sleeves with a highly breathable back. This will be your favorite lightweight insulation layer on a mountain pursuit, hike, or even jogging in frigid temperatures.