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Montbell Plasma 1000 vs Rab Alpha Flash

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

Montbell Plasma 1000 is the lighter option — 116 g lighter than the Rab Alpha Flash (45% less weight). If grams matter to you, that is the one to beat.
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Spec Montbell Plasma 1000 Rab Alpha Flash
Weight 139 g · 0.139 kg · 0.31 lb 255 g · 0.255 kg · 0.56 lb
Brand Montbell Rab
Category Clothing - Mid Layer Clothing - Mid Layer
Montbell Plasma 1000
139 g

Ultralight down jacket with 1000-fill goose down. Men's weighs just 139g with exceptional warmth-to-weight.

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Rab Alpha Flash
255 g

Lightweight fleece jacket using Polartec Alpha Direct fabric. Breathable and packable mid-layer for expeditions with minimalist weight philosophy.

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Montbell Plasma 1000 vs Rab Alpha Flash: which should you buy?

If saving weight is your priority, the Montbell Plasma 1000 wins — at 139 g it is 116 g (45%) lighter than the Rab Alpha Flash (255 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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