Arc'teryx Atom Jacket vs Montbell U.L. Thermawrap 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.
Full details →Ultralight synthetic Exceloft insulated jacket with 15D Ballistic Airlight nylon shell, highly packable for cool weather.
Full details →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 Montbell U.L. Thermawrap Jacket: which should you buy?
If saving weight is your priority, the Montbell U.L. Thermawrap Jacket wins — at 227 g it is 128 g (36%) 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.