Rab Neutrino Pro 400 Review (2026)

Rab has built its reputation in serious UK and European mountaineering circles, and the Neutrino Pro 400 reflects that pedigree: hydrophobic-treated down that resists moisture absorption better than untreated down, paired with Pertex Quantum shell fabric known for a strong balance of wind resistance, breathability, and low weight. At 14°F comfort rating and 2lb 2oz, it competes directly with the best American cottage and mainstream bags, offering a genuine alternative for hikers wanting a European-engineered option.

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$480 retail

9.1

/10

TrailCraft Score

What Works

Hydrophobic down resists moisture absorption better than standard untreated down
Pertex Quantum shell offers an excellent wind resistance and breathability balance
14°F comfort rating at 2lb 2oz is a strong warmth-to-weight ratio
Rab's respected reputation in serious mountaineering and alpine circles

Limitations

$480 is a premium price point
Less widely available in US retail than domestic competitors
Contoured hood design has a learning curve for optimal fit
Sizing runs differently than US brands, requiring careful size chart review

Specifications

Fill Power800 fill power hydrophobic down

Weight2 lb 2 oz / 964 g

Temp Rating14°F comfort

ZipperFull-length, dual-slider

HoodContoured hood with face baffle

ShellPertex Quantum ripstop

WarrantyLimited lifetime

OriginMade in United Kingdom

Score Breakdown

Warmth

9.3

Weight / Compression

8.8

Build Quality

9.2

Value for Money

6.5

Brand & Warranty

9.2

What Sets It Apart

At 14°F comfort rating and 2lb 2oz, it competes directly with the best American cottage and mainstream bags, offering a genuine alternative for hikers wanting a European-engineered option.

2lb 2oz, $480, 14°F comfort — hydrophobic down and Pertex Quantum from a respected UK mountaineering brand

Who This Is For

The Rab Neutrino Pro 400 is right for hikers whose priorities match its design: built around premium european down bag, at 2 lb 2 oz and $480.

A note on pricing and links: Prices listed are current as of July 2026 and may change. Some links on this page are affiliate links — if you buy through them, I earn a small commission at no extra cost to you. It does not change my ranking.

How It Compares

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All options in this category ranked side by side — specs, scores, and pricing.

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Common Questions

What is hydrophobic down?

Down treated with a water-resistant coating at the fiber level, helping it resist moisture absorption and maintain loft better than untreated down in humid conditions or light precipitation, though it's not a substitute for keeping a bag genuinely dry.

Is Rab as well-known as American cottage brands like Western Mountaineering?

Rab has an equally strong, if different, reputation, particularly in UK and European mountaineering and alpine climbing communities, though it may be less familiar to some US backpackers than domestic cottage brands.

Does Rab sizing match US brands?

Not always directly — check Rab's specific size chart carefully, as UK-based brands sometimes size differently than US-based competitors.