The premium fleece made of Polartec Power Gridâ„ material is light, incredibly soft and super comfortable on the skin. The patented waffle structure offers an excellent warmth-to-weight ratio and keeps the jacket extra breathable. It also dries quickly and packs down small. The Aconcagua Light Hoody can be worn on its own or as a mid-layer when mountaineering, climbing, ski touring or hiking.