The Arc'teryx Atom Hoody Men is a light, versatile synthetically insulated hoody that works as a midlayer and standalone. Atom Series: Synthetic insulated midlayers. Alpine proven as a midlayer and standalone, this versatile hoody has warmed climbers and backcountry travelers for years. Built to handle a range of conditions and output levels, the latest generation Atom’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, stretch side panels improve fit and freedom, and the insulated StormHood adds warmth. *The Atom Hoody was previously the Atom LT Hoody.