Arc'teryx Atom Vest 2027 – Insulator

The Arc'teryx Atom Vest is a synthetic insulating mid-layer built for active mountain pursuits. Designed for hikers, climbers, and backcountry skiers who need reliable warmth without the bulk, it excels as a standalone piece on cool approaches or as a mid-layer under a shell in wet, demanding conditions.

Constructed with stretch Coreloft synthetic insulation that retains warmth even when damp, the Atom Vest pairs a lightweight recycled-content Fortius™ Air 20 nylon shell treated with FC0 PFAS-free DWR with breathable Octa® Fleece side panels that add ventilation and unrestricted movement. Ergonomic patterning and an adjustable hem drawcord round out a trim, packable package sized for layering.

This vest is the right call for high-output days when a full jacket would overheat you but you still want core warmth on exposed ridges or cold belays. It suits skiers who tour into the backcountry, climbers who run hot on the way up, and trail runners tackling shoulder-season conditions. The synthetic fill means you won't lose warmth if the weather turns wet — a real advantage over down on unpredictable alpine days.

• Can the Atom Vest be worn as an outer layer? Yes — the DWR-treated shell handles light moisture, making it suitable as a standalone piece in dry to lightly damp conditions.
• Is the insulation sustainably sourced? The insulation, lining, and shell all incorporate recycled content and meet bluesign® production criteria.