This Cerium Hybrid Hoody from Arc'teryx is a very unique lightweight hybrid-insulated hoody that combines the warmth of down insulation in the core and upper outer arms with strategically placed Coreloft Synthetic insulation in the shoulders and collar, along with wind resistant breathable stretch woven panels in the lower sleeves, waist, side panels, and underarms. The design give you warmth where you need it, extra moisture protection in moisture prone areas, and breathability and stretch where you need it from comfort and freedom of movement. Great for hiking, alpine climbing, rock climbing, backcountry skiing, ice climbing, trekking, and snowshoeing. An extremely versatile piece to add to your outdoor adventure kit.