Arc'teryx Atom Jacket vs Montbell Plasma 1000 Down Jacket

Weight and specs compared for 2026 — and which one to choose.

Montbell Plasma 1000 Down Jacket is the lighter option — 170 g lighter than the Arc'teryx Atom Jacket (48% less weight). If grams matter to you, that is the one to beat.

Spec	Arc'teryx Atom Jacket	Montbell Plasma 1000 Down Jacket
Weight	355 g · 0.355 kg · 0.78 lb	185 g · 0.185 kg · 0.41 lb
Brand	Arc'teryx	Montbell
Category	Clothing - Mid Layer	Clothing - Mid Layer

Arc'teryx Atom Jacket

355 g

Insulated mid-layer with Coreloft Compact synthetic fill and stretch panels. PFAS-free DWR finish (2025). Versatile for active use in cold wet conditions.

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Montbell Plasma 1000 Down Jacket

185 g

Ultralight 1000-fill down jacket. Among the lightest available.

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Arc'teryx Atom Jacket vs Montbell Plasma 1000 Down Jacket: which should you buy?

If saving weight is your priority, the Montbell Plasma 1000 Down Jacket wins — at 185 g it is 170 g (48%) lighter than the Arc'teryx Atom Jacket (355 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest clothing - mid layer page, or browse the full gear weight database.

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