Arc'teryx Atom Jacket vs Rab Cirrus Flex 2.0 Jacket
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 jacket for damp conditions.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.
Arc'teryx Atom Jacket vs Rab Cirrus Flex 2.0 Jacket: which should you buy?
If saving weight is your priority, the Rab Cirrus Flex 2.0 Jacket wins — at 295 g it is 40 g (12%) 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.