Alpine-proven as a mid-layer and standalone, the versatile Arc'teryx Men's Atom LT Hoody has warmed climbers, explorers, and backcountry travelers for years. Built to handle a range of conditions and output levels, the latest-generation Atom LT's Coreloft Compact insulation retains its warmth (even if wet) and has loft retention to withstand years of packing and unpacking. The water-resistant Tyono 20 face fabric is breathable and durable, and the insulated StormHood supplies warmth.