Arc'teryx Cerium SL vs Rab Mythic Alpine Light Jacket
Weight and specs compared for 2026 — and which one to choose.
1000 fill power down with synthetic insulation at shoulders for durability.
Full details →900 fill power goose down with PrimaLoft Gold, 8.8oz, ultralight insulation jacket
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Arc'teryx Cerium SL vs Rab Mythic Alpine Light Jacket: which should you buy?
If saving weight is your priority, the Arc'teryx Cerium SL wins — at 235 g it is 17 g (7%) lighter than the Rab Mythic Alpine Light Jacket (252 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.