Arc'teryx Atom Vest

The Atom Vest distils the dependable warmth of the Atom series into a packable, low-profile layer for high-output days. Coreloft stretch synthetic insulation keeps your core warm even if the weather turns damp, while the Fortius Air 20 shell with FC0 DWR finish sheds light moisture. Octa fleece side panels add stretch and ventilation, and the lightweight recycled liner helps the vest pack down easily for stashing in a pack.

Designed for hiking, climbing, and touring, the vest works as a standalone layer when the temperature drops or as a midlayer under a shell for wet winter objectives. The adjustable hem seals out drafts, and two hidden-zipper hand pockets keep small essentials close at hand. Ergonomic patterning and a trim, close-to-body fit provide freedom of movement without bulk, making it an easy layer for varied days outdoors.