Arc'teryx Atom Hoody vs Arc'teryx Atom Jacket

Both are the same idea: a light Coreloft synthetic layer that works as a midlayer or a cool-weather outer. The Atom Hoody adds a hood and comes in a trim fit, which makes it the better pick for hiking, climbing and camping where you want head coverage without a hat. The Atom Jacket has no hood, a fitted cut and stretch fleece side panels, so it layers under a shell and vents better on the move. Owners of the Atom line praise the warmth-to-weight and packability but criticize durability and wind and rain resistance, so treat either as a layer, not a stand-alone storm jacket.

• Choose the Atom Hoody if you want a hood for windy summits, campsites and belays, and you prefer a trim fit that works solo or under a shell.
• Choose the Atom Jacket if you mostly wear it under a hardshell or around town and want stretch side panels, a fitted cut and no hood bulk at the collar.