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Montbell U.L. Thermawrap Jacket vs Rab Alpha Flash

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

Montbell U.L. Thermawrap Jacket is the lighter option — 28 g lighter than the Rab Alpha Flash (11% less weight). If grams matter to you, that is the one to beat.
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Spec Montbell U.L. Thermawrap Jacket Rab Alpha Flash
Weight 227 g · 0.227 kg · 0.50 lb 255 g · 0.255 kg · 0.56 lb
Brand Montbell Rab
Category Clothing - Mid Layer Clothing - Mid Layer
Montbell U.L. Thermawrap Jacket
227 g

Ultralight synthetic Exceloft insulated jacket with 15D Ballistic Airlight nylon shell, highly packable for cool weather.

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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 U.L. Thermawrap Jacket vs Rab Alpha Flash: which should you buy?

If saving weight is your priority, the Montbell U.L. Thermawrap Jacket wins — at 227 g it is 28 g (11%) 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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