Description The Arc'teryx Atom 2027 is a synthetic insulated mid-layer built for active outdoor pursuits — from ridge-top hikes and crag days to backcountry touring. Designed without a hood for a streamlined profile, it works equally well as a standalone piece in cool conditions or as a thermal layer under a shell in harsher weather. At its core is Coreloft Compact 60 insulation, a breathable, lightweight synthetic fill that retains warmth even when exposed to moisture — a clear advantage over down on high-output days. The Tyono 20 shell is treated with an FC0 DWR finish (PFAS-free) for light weather resistance, while performance stretch fleece side panels allow airflow and unrestricted movement. A fitted, articulated cut keeps bulk low without sacrificing mobility, and the whole jacket compresses easily into its own internal chest pocket when not in use. Glove-friendly No Slip Zip hardware and an adjustable hem cord round out a well-considered feature set. Insulation and lining both carry bluesign-certified recycled content. Who it's for The Atom is ideal for athletes who move fast and generate heat — skiers, scramblers, and trail runners who need insulation that won't overheat or stay soggy mid-effort. It's also a reliable camp layer for those who run cold once they stop moving. If your days mix sustained effort with unpredictable weather, this jacket earns its place in the pack. FAQ Can the Atom be worn as an outer layer? Yes — in dry to lightly damp conditions, the DWR-treated shell handles brief weather exposure well, though it is not a waterproof jacket. Does the insulation stay warm when wet? Yes. Coreloft Compact 60 is a synthetic insulation specifically engineered to retain warmth even when moisture is present, unlike most down fills.
