Light, packable and proven Coreloft™ Compact 60 insulation retains heat even when wet and springs back from compression time and time again making the Arc'teryx Atom Men's Jacket an incredibly versatile performance warming layer for the backcountry, alpine ascents or just your everyday bike commute. The soft feeling yet durable Tyono™ 20 face fabric resists both wind and weather, should you get caught in it, while stretch fleece side panels improve ventilation and pulls the jacket into a trim shape for layering without sacrificing easy movement. Fitted, with articulated tailoring for movement, this glides nicely under a ski or hiking shell when you need a fluffy midlayer, packs down for minimal space in a pack, and comes in at only 11.6 ounces so it won’t weigh you (or your pack) down. Weather resistant warmth in a very versatile performance piece you can take with you anywhere.