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Arc'teryx Cerium SL Down Jacket vs Montane Protium Hooded Fleece

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

Arc'teryx Cerium SL Down Jacket is the lighter option — 155 g lighter than the Montane Protium Hooded Fleece (40% less weight). If grams matter to you, that is the one to beat.
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Spec Arc'teryx Cerium SL Down Jacket Montane Protium Hooded Fleece
Weight 235 g · 0.235 kg · 0.52 lb 390 g · 0.390 kg · 0.86 lb
Brand Arc'teryx Montane
Category Clothing - Mid Layer Clothing - Mid Layer
Arc'teryx Cerium SL Down Jacket
235 g

Ultralight down jacket at 8.3 ounces with exceptional packability.

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Montane Protium Hooded Fleece
390 g

Midweight fleece at 13.7oz. Warm and weather-resistant with hood.

Full details →

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Arc'teryx Cerium SL Down Jacket vs Montane Protium Hooded Fleece: which should you buy?

If saving weight is your priority, the Arc'teryx Cerium SL Down Jacket wins — at 235 g it is 155 g (40%) lighter than the Montane Protium Hooded Fleece (390 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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