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The Atom SL Hoody is Arc'teryx's lightest insulated hoody, built for cool-weather movement rather than cold-weather standing around. It pairs a thin 40gsm Coreloft Stretch core with uninsulated Fortius Air 20 nylon at the sleeves and hood, so it breathes hard and packs down small. At around 280g it slots between a windshell and a midweight puffy, closer to a Patagonia Nano-Air Light or a windproof fleece than to the Atom LT. It suits fast hikers, runners and climbers who want a little warmth without sweat, not people wanting a standalone winter jacket.
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Lowest price we've seen: $280.00 on Nov 11 at Amazon. Tracked across 1 store since Nov 11.
Owners rate it as an excellent active layer that breathes and moves well, and many call it their most-used piece for cool-weather hiking and climbing. The recurring complaints are that it is too thin for cold standing around and that the slim fit leaves little room for layering.
The Arc'teryx Atom SL Hoody is a fitted insulated hooded jacket for alpine, hiking and everyday use. It weighs 280 g.
The face fabric is Fortius Air 20 plain weave with an FC0 DWR finish, at 58 gsm. The core insulation is Coreloft Stretch at 40 gsm. The side panels are Octa polyester fleece with a 40D Delta face, at 122 gsm.
