Arc'teryx Atom Jacket vs Arc'teryx Proton LT Hoody
Weight and specs compared for 2026 — and which one to choose.
Insulated mid-layer with Coreloft Compact synthetic fill and stretch panels. PFAS-free DWR finish (2025). Versatile for active use in cold wet conditions.
Synthetic insulated hoody with excellent moisture management.
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Arc'teryx Atom Jacket vs Arc'teryx Proton LT Hoody: which should you buy?
If saving weight is your priority, the Arc'teryx Proton LT Hoody wins — at 285 g it is 50 g (15%) lighter than the Arc'teryx Atom Jacket (335 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.