Light. Comfortable. Warm. Breathable. Summed up, the Nano-Air is all these things and more. A piece we purchased this year for our guides, it almost never stays in the closet. You can spot our trips all over the mountain encased in this versatile active insulation layer. Made with synthetic insulation, you don't have to worry about the weather turning, as this wonderful jacket will still be able to maintain it's insulative properties and dry out fast. The breathable fabric locks in heat when you need it, and dumps it when you get cooking on the trail, meaning that there's no need to be pulling this layer on and off. Just zip up and go. You'll never hang this puffy up again after you pull it off the shelf. From the summit to the pub you'll be happy to know Patagonia has you covered with their Nano-Air Hoody.