Arc'teryx Atom Jacket

The Arc'teryx Atom Jacket is a lightweight synthetic insulated midlayer engineered for alpine movement. Its 20D nylon ripstop shell and recycled Coreloft™ 60 insulation deliver a high warmth-to-weight ratio, while stretch Circular Knit Fleece side panels allow freedom of movement and efficient heat dumping.

The jacket performs where mountain weather shifts: it resists light precipitation and wind, breathes during high-output hiking, and layers cleanly under a hardshell in harsher conditions. Articulated patterning and side hem vents support a full stride, and dual hem cinches seal out drafts at rest.

For all-mountain use, the Atom is a versatile, packable midlayer that maintains its loft and performance season after season.