Arc'teryx Atom SL Hoody

Lightest and most packable of the Atom family, the Atom SL Hoody is built for high-output days in cold, wet conditions. Its Fortius™ Air 20 face fabric balances air permeability with weather resistance, while a PFAS-free FC0 DWR finish sheds light precipitation. The result is a breathable, wind-resistant layer that performs on its own over a baselayer or adds focused warmth beneath a waterproof shell during demanding mountain outings.

Focused core warmth comes from 40 g/m² Coreloft™ Stretch synthetic insulation made with recycled content, while the uninsulated, mesh-lined sleeves and low-profile StormHood trim weight and bulk where you don’t need it. Stretchy Octa® fleece side panels improve ventilation and range of motion, and the articulated, close-to-body patterning keeps it comfortable through dynamic movement. Two zippered hand pockets, an adjustable hem draw cord, and excellent compressibility make it an easy layer to pack and reach for on the trail.