Men's Atom SL Jacket

The Arc'teryx Men's Atom SL Jacket is the lightest insulated option in the line, built for mid-output mountain use where you want warmth without feeling boxed in. It’s a superlight, abrasion-resistant hiking jacket that delivers targeted warmth through recycled stretch insulation at the core, while staying breathable where you tend to heat up.

Uninsulated sleeves and stretchy, fleece-lined side panels dump heat and make overhead movement feel natural—whether you’re hiking in the shoulder season or heading out for an easy winter run. It’s made for hikers, but it’s the kind of layer you’ll see on athletes, runners, skiers, and guides because it packs down easily and keeps performing when conditions shift.