Name: Rab Neutrino Pro
Brand: Rab

The Rab Neutrino Pro delivers exceptional warmth for its weight and size, packing 7.5 ounces of 800-fill-power down. While it doesn’t match the absolute heat of heavyweight options like the Fjallraven Expedition, it’s far more streamlined and purpose-built for backcountry missions. In addition to its insulation, the Neutrino Pro’s wind-resistant Pertex Quantum Pro shell fabric offers a noticeable barrier from the elements, boosting thermal efficiency by trapping body heat and blocking biting gusts. Compared to the Patagonia Fitz Roy (6.4 oz. of 800-fill), the Neutrino Pro feels noticeably warmer and better suited for sustained cold.

Living in Jackson, Wyoming, I rely on a warm insulated jacket almost daily through the winter. The Neutrino Pro became my go-to this season for both around-town use and deep-freeze days in the Tetons, and it never left my ski pack for transition breaks during tours. It was exactly what I wanted for -10°F conditions in Grand Teton National Park—layered over a base layer and midweight synthetic jacket, it kept me cozy during summit breaks and parking lot hangouts. For town use in the 20s, I’d just throw it on over a button-down and be perfectly comfortable. Overall, the Neutrino Pro hits a rare sweet spot of serious warmth, low weight, and backcountry-ready packability.

Zipping up the Rab Neutrino Pro winter jacket

Despite its technical intentions, the Rab Neutrino Pro is one of the comfiest jackets I’ve worn. The large baffles packed with lofty 800-fill down and the generous hood and collar make it feel like I’m being swaddled by a goose’s luscious coat—truly, it’s like wearing a cloud. The fabric is silky-smooth inside and out and never abrasive, even on bare arms in a T-shirt, which is more than I can say for other down puffies I’ve used. The soft fleece patches around the mouth and zipper garage are thoughtful, comfort-first touches.

If you’ve ever dreamed of wearing a sleeping bag in jacket form, the Neutrino Pro gets pretty close. While it’s not stretchy and definitely not built for dynamic movement like many synthetic insulated jackets, it kept me cozy during ski transitions at Hatcher Pass, cabin hangs on Jackson Lake, and on wind-blasted ridgelines in the Tetons. It’s even breathable enough that I didn’t mind layering it under a shell in sub-zero conditions.

Internal baffles of the Rab Neutrino Pro winter jacket

The Rab Neutrino Pro isn’t waterproof, but its Pertex Quantum Pro shell does a commendable job keeping the elements at bay. Throughout a winter in the Tetons, it consistently shed light rain and wet, dense snow. Even in steady moisture, the jacket kept me dry—right up until a full-on downpour, when it eventually soaked through. The down fill is treated with a Grangers hydrophobic coating, which should help it retain loft when wet, though I wouldn’t want to test those limits.

The Neutrino Pro’s wind protection is also solid: On gusty days in Jackson and along exposed ridgelines in the Tetons, I felt well-sealed inside. The adjustable hem and cuffs cinch down securely without feeling restrictive, and the hood—complete with a structured brim—stayed put in heavy winds. It’s not a waterproof shell like the REI Co-op Stormhenge 850, but for cold, dry mountain conditions, the Neutrino Pro offers all the protection most users will need. Compared to the Patagonia Fitz Roy Down Hoody, which uses a standard Pertex Quantum shell, it’s a noticeable step up (read our Fitz Roy review).

Water droplets on the Rab Neutrino Pro winter jacket

Storage is where the Rab Neutrino Pro clearly leans technical over lifestyle. You get two zippered hand pockets positioned high enough to sit above a hipbelt or harness, a small internal zippered chest pocket, and one internal drop pocket. That’s just enough space for the essentials—phone, snacks, gloves, keys—but far less than you’ll find on bulkier winter parkas. Even the similarly backcountry-oriented Patagonia Fitz Roy offers more storage with its dual chest pockets. The Neutrino Pro prioritizes minimalism and alpine efficiency, but if you’re hoping to stuff your jacket with mittens, goggles, or a thermos and snacks, you’ll run out of room fast.

Hands in pockets of tohe Rab Neutrino Pro winter jacket

Internal dump pocket of the Rab Neutrino Pro winter jacket

Putting phone in the internal chest pocket of the Rab Neutrino Pro winter jacket

The Rab Neutrino Pro isn’t built like a tank the way many everyday winter jackets are, but it’s impressively tough for a backcountry-focused puffy. Its 20-denier Pertex Quantum Pro shell is significantly burlier than fabrics found on ultralight jackets like the Rab Mythic G (7D) or even the Patagonia Fitz Roy (also 20D but without the “Pro” treatment). I wore it for about 50 days this winter—brushing against sharp kitchen corners in a ski cabin, hauling gear in a janky Alaskan bush plane, and pushing through dense brush—and never tore the shell once. The seams occasionally let loose a stray feather, but the zippers have been smooth and reliable, and nothing has failed yet. You’ll want something tougher for daily wear or winter chores (The North Face McMurdo comes to mind), but for a technical puffy, the Neutrino Pro is impressively durable and should outlast most in its class.

Jumping in a puddle in the Rab Neutrino Pro winter jacket

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Longevity

Choosing durable outdoor gear is perhaps the most effective way to reduce environmental impact—the longer it lasts, the less it needs to be produced. Our proprietary longevity rating evaluates overall build quality based on factors such as materials, fabric denier, component durability (including zippers and toggles), real-world performance as reported by our field testers, and our experiences with the brand.

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The Rab Neutrino Pro comes well-equipped for technical use, with a thoughtful set of features that don’t add unnecessary bulk. The fully adjustable hood fits over a climbing helmet and includes a stiffened brim that holds its shape well in wind and snow. The hand pockets sit high enough to remain accessible with a harness or hipbelt on, and I routinely used the internal chest pocket to store my phone. The cuffs secure with hook-and-loop closures, which in my opinion felt unnecessary—I would have preferred simple elastic cuffs, but some skiers or climbers might feel otherwise. All told, the Neutrino Pro isn’t packed with extras, but what features it does include are dialed for mountain performance.

Adjusting cuff of the Rab Neutrino Pro winter jacket

Adjusting hood on the Rab Neutrino Pro winter jacket

Hem adjustment on the Rab Neutrino Pro winter jacket

The Rab Neutrino Pro runs true to size. I’m 5’11” and typically bounce between a medium and a large, depending on the brand—mediums often feel tight in the shoulders—but the medium Neutrino Pro fit me well, with ideal sleeve length and torso coverage. With a center back length of 30.3 inches, it offers generous over-the-butt coverage, which kept me well protected when bending down or reaching up to strap skis to my roof rack (for comparison’s sake, the Fitz Roy’s center back length is 29 in., while the TNF McMurdo is 32.2 in.). I’m built a bit like an orangutan, so reaching overhead or across my body felt slightly snug in the shoulders—but that’s more about my build than the jacket’s cut.

Overall, the fit strikes a nice balance between trim and roomy, well-suited for both everyday wear and backcountry use. I’ve layered it under my ski jacket a few times in desperate conditions where I needed every bit of insulation, but it’s generally not built to be a midlayer. On the other hand, it is roomy enough to accommodate a lightweight synthetic jacket underneath, like my Patagonia Nano-Air Light Hybrid.

Walking down road in the Rab Neutrino Pro winter jacket

Patagonia Fitz Roy Down Hoody ($399): Reporting for (Lighter) Duty
The Fitz Roy is another technical winter jacket with strong similarities to the Neutrino Pro, but it fills a different niche. While the Neutrino is built to maximize warmth at the belay or basecamp and handle harsh mountain weather, the Fitz Roy is better suited to quick-strike missions and half-day tours in milder conditions. That’s reflected in the fill weights: 7.5 ounces of 800-fill down in the Rab vs. 6.4 ounces in the Patagonia. The Fitz Roy’s 20-denier nylon shell also doesn’t match the wind resistance, water repellency, or durability of the Neutrino Pro’s Pertex Quantum Pro fabric. That said, it offers better storage with two hand pockets, two exterior chest pockets, and an internal drop pocket. Just make sure to check the thermometer and forecast before reaching for this lighter-duty piece. For more, read our review of the Patagonia Fitz Roy Down Hoody.

REI Co-op Stormhenge 850 ($279): More Casual, but More Waterproof
If you want the warmth and coziness of a down puffy without looking like you’re heading to basecamp, the Stormhenge 850 is a compelling pick. It features loftier 850-fill down than the Neutrino Pro, but its design is much more casual, with a focus on daily use rather than alpine missions. The big advantage here is waterproofing: a 2-layer REI membrane and robust DWR coating give it a significant edge in wet weather. While warmth is comparable between the two jackets, the Stormhenge is bulkier and heavier, with extras like pit zips, ample storage, and burly shell fabric that reduce its packability. If weather protection and urban versatility matter more than weight and compression, this is a strong alternative. For a deeper dive, read our REI Co-op Stormhenge 850 review.

Rab Neutrino Pro ($425)

Snow on front of the Rab Neutrino Pro winter jacket

4.2/5

Perhaps the most technical jacket we tested, the updated Neutrino Pro blends impressive warmth and comfort into a light, packable design. It’s not waterproof, though, and its lack of storage makes it much better suited for the mountains than for use around town.

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Weight

1 lb. 3.9 oz.

Insulation

7.5 oz. of 800-fill down

Waterproofing

None

Back Length

30.3 in.

Warmth

4.5/5

Comfort

4.5/5

Weather Protection

3/5

Storage

2.5/5

Durability

2.5/5

Sustainability

4.3/5

Patagonia Fitz Roy Down Hoody ($399)

Smiling in the Patagonia Fitz Roy Down Hoody

3.8/5

The lightest jacket in this gear guide is also one of the most comfortable. The Fitz Roy leverages lofty down and soft materials to achieve a feel that might seem slightly sinful in the backcountry, but its warmth and weather resistance both rank relatively low.

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Weight

1 lb. 1.1 oz.

Insulation

6.4 oz. of 800-fill down

Waterproofing

None

Back Length

29 in.

Warmth

3.5/5

Comfort

4.5/5

Weather Protection

2/5

Storage

4/5

Durability

2.5/5

Sustainability

5/5

REI Co-op Stormhenge 850 Down Hybrid ($279)

Hands in pockets of the REI Co-op Stormhenge 850 Down Jacket Hybrid

4.7/5

The Stormhenge is by far the least expensive winter jacket we tested, but it feels like a much more premium product. Lofty down and a dialed feature set make for a superb coat overall, but its bland styling might give some folks pause.

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Weight

1 lb. 13.6 oz.

Insulation

850-fill down + synthetic

Waterproofing

2-layer HydroWall

Back Length

31.5 in.

Warmth

4/5

Comfort

4.5/5

Weather Protection

4.5/5

Storage

4.5/5

Durability

3.5/5

Sustainability

4.7/5

Is the Neutrino Pro for You?

The Rab Neutrino Pro is ideal for winter backcountry-goers who need serious warmth without the bulk or flash of a lifestyle parka. If you’re an ice climber, backcountry skier, mountaineer, or cold-weather backpacker looking for a puffy to keep you warm during transitions, belays, or summit hangs without weighing down your pack, this jacket is a top contender. There are lighter options out there (like the Patagonia Fitz Roy), but the Neutrino Pro offers far better durability and weather resistance, not to mention a bit of added warmth. All told, it’s a mountain-ready winter down puffy that puts it all together—and it doesn’t look half bad around town, either.