The Arc'teryx Atom SV Men's Hoody is the warmest member of the Atom family, a synthetic insulated hoody built for severe cold. It loads up on lofty synthetic insulation, adds an insulated hood, and wraps it in a wind-resistant, lightly water-repellent face. Whether it is your belay jacket or your deep-winter outer layer, it delivers a lot of warmth for its weight.

Why we like it:

The SV badge means severe, and the extra insulation earns it; this is the Atom you grab when standard synthetic layers are not enough. The insulated hood seals warmth around your head without the bulk of a down jacket.

Features and Functions:

The Atom SV is insulated with Coreloft 120, a 120 gram synthetic fill that retains warmth even when damp, under a Tyono 30 nylon face that resists wind and moisture. A 20 denier recycled ripstop liner keeps it comfortable next to skin, the insulated hood adds real cold-weather coverage, and an updated FC0 PFAS-free DWR finish handles light precipitation.

Fit and Sizing:

A regular fit leaves room to layer a fleece or baselayer underneath and pulls over a helmet at the hood. True to size, with enough length to stay tucked in on cold chairlifts.

Bottom Line:

For cold belays, frigid resort days, and alpine missions where warmth is the priority, the Atom SV is best at high-output cold-weather insulation. The pick when you want serious synthetic warmth that still breathes.