A favorite with climbers, hikers, and backcountry enthusiasts for years the Arc'teryx Atom Men's Hoody is designed with a trim fit supported by stretch side panels for easy movement and gliding under everything from a light hiking shell to a winter backcountry shell. This has the latest-generation Coreloft™ Compact insulation which retains warmth even when wet and has loft retention designed to withstand years of squashing down into a pack and unpacking for immediate warmth. Water resistant Tyono™ 20 face fabric provides durability and breathability with the stretch side panels giving you a low profile fit and freedom of movement. An insulated StormHood™ adds warmth when you need it, and hem adjusters allow you to further lock in the heat. A great core piece for winter layering systems you’ll keep in the front of the closet for getting out there any time the weather is chill or damp.