Montbell Plasma 1000 vs Rab Alpha Flash Lightweight Fleece
Weight and specs compared for 2026 — and which one to choose.
Ultralight down jacket with 1000-fill goose down. Men's weighs just 139g with exceptional warmth-to-weight.
Full details →Ultralight fleece with Polartec Alpha Direct 120 insulation. Men's Large: 272g. Slim fit, brushed back, flatlock seams, YKK zips.
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Montbell Plasma 1000 vs Rab Alpha Flash Lightweight Fleece: 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 Lightweight Fleece (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.