Arc'teryx Atom Hoody - Men'sThis versatile hoody is suitable for use as a standalone or midlayer, providing synthetic insulation. Part of the Atom Series, it offers a synthetic insulated midlayer. *Formerly known as the Atom LT Hoody. This hoody has been thoroughly tested and proven effective as a midlayer and standalone option in the alpine. It has been relied on by climbers and backcountry travelers for many years. The newest version of the Atom incorporates Coreloft Compact