Arc'teryx Atom Jacket 2027 – Insulator

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.

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.

• 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.