A true refuge from the elements, this iconic down jacket offers thermal comfort, freedom of movement, and compressibility—ideal for mountaineering and other high-altitude expeditions. It easily sheds snow thanks to its weather-resistant Pertex® Quantum Pro exterior with unbreakable construction for added durability. It's filled with 800 cubic inches of down with through-seam baffling, allowing it to be compressed and stowed in your pack. On icefalls and exposed cornices, the Neutrino Pro lets you move freely thanks to its specially designed sleeves.