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Rab Nucleus Hoody - Women's Review

This light fleece is a high-performance layer that is breathable and comfortable
Rab Nucleus Hoody - Women's
Rab Nucleus Hoody
Credit: Rab
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Price:  $140 List
Pros:  Lightweight, breathable, full-length zipper and a hood
Cons:  Not very warm, no weather resistance
Manufacturer:   Rab
By Amber King & Cam McKenzie Ring  ⋅  Oct 17, 2019
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  • Warmth - 20% 7.0
  • Comfort and Fit - 20% 7.0
  • Breathability - 20% 9.0
  • Layering Ability - 20% 9.0
  • Ease of Movement - 15% 8.0
  • Weather Resistance - 5% 5.0

Our Verdict

Rab discontinued the Nucleus Hoody.

The Rab Nucleus Hoody was redesigned in 2018, and we love the changes. The new material is stretchy and comfortable, with a high range of motion in the arms and shoulders. The full-length zipper lets you take it on and off easily, and the zippered hand pockets help you secure your valuables. It functions as both a technical and casual layer. It can be used with a climbing harness or belt, but the zippers aren't high enough to be accessed while doing so. It breathes well and will get you from point a to point b, thermoregulating all the way. We love the price, making it a high-value technical fleece option.

Our Analysis and Test Results

The Rab Nucleus is made with a "Thermic" stretch fleece. Rab calls it a mid-weight fleece, but it feels more like a lightweight option. It's light, breathable, and will get you from your car, high into the mountains without a problem. It's a great option if you're looking for a technical fleece that is inexpensive relative to the competition.

Performance Comparison

Rab Nucleus Hoody - Women's fleece jacket - out for a pre-dawn mission in the nucleus hoody. this layer kept us...
Out for a pre-dawn mission in the Nucleus Hoody. This layer kept us warm when hiking fast on a cold start, and it's highly breathable. The pockets are a nice option for keeping your hands warm as well.
Credit: Cam McKenzie Ring


The Nucleus sacrifices warmth for breathability and easy layering. It's one of the thinnest pieces in our test group, and it's made for moving fast in the mountains and not hanging out at camp in cold weather. This is not necessarily a bad thing, as we often need something that will keep us warm on cool days without overheating our bodies.

Rab Nucleus Hoody - Women's fleece jacket - this fleece is on the thin side and not as warm as many of the other...
This fleece is on the thin side and not as warm as many of the other models that we tested. The hood helps retain warmth, and it fits nicely under a helmet, but it doesn't have the same full face gaiter that the Patagonia R1 and Arc'teryx Fortrez Hoody have.
Credit: Cam McKenzie Ring


The Nucleus is a fairly comfortable layer for several reasons. The interior gridded fleece is soft, and it feels nice against your bare skin — not scratchy at all! The hood is form-fitting but not too tight, and the cut is tapered but not too constricting. We like that the hood fits easily underneath a helmet. It's not quite as plush as other hi-loft models, but we don't mind wearing it all day long. It also features two handwarmer pockets that you can access with a backpack or harness on.

Rab Nucleus Hoody - Women's fleece jacket - hand pockets are a nice touch and add to the overall coziness and...
Hand pockets are a nice touch and add to the overall coziness and comfort of a fleece jacket.
Credit: Cam McKenzie Ring


This jacket is highly breathable thanks to the gridded fleece. It feels on par with other technical fleeces that are featured as top picks and award winners in this review. We took it hiking, climbing, and running, and it performed well in all seasons, thanks to its fantastic thermoregulation. The fabric features Grid technology that allows moisture to easily vent from the cracks between the islands of insulation. This, in addition to the pockets, offers some level of ventilation, making it a perfect pick for aerobic sports.

Rab Nucleus Hoody - Women's fleece jacket - this model uses the same grid technique as the polartec power grid...
This model uses the same grid technique as the Polartec Power Grid fleeces. The channels offer a thin layer for your moisture to escape.
Credit: Cam McKenzie Ring

Layering Ability & Ease of Movement

The Nucleus is super easy to layer. It works over a thin underlayer, like a sweat-wicking t-shirt or tank top, and then it also layers well under a thicker soft-shell jacket or a windbreaker jacket. The material is stretchy, and there is ample room in the shoulders for climbing or other active pursuits. The full-length zipper is not our favorite option for wearing under a pack or harness, as it can cause pressure points, but the length is long enough so that it doesn't ride up.

Rab Nucleus Hoody - Women's fleece jacket - we could layer just about every which way with this model. over a...
We could layer just about every which way with this model. Over a base layer, under a heavier jacket, with a harness, with a backpack, etc, etc. Our only quibble is that a full-length zipper isn't always the most comfortable option when paired with a waist belt.
Credit: Sanni McCandless

Weather Resistance

Fleece jackets are not known for their weather resistance, and this one scored about how you might expect a thin fleece would — not very well! Water absorbs straight into the material, and the wind rips right through it.

Rab Nucleus Hoody - Women's fleece jacket - the exterior of this fleece offers no protection from the elements...
The exterior of this fleece offers no protection from the elements. Water soaks right in and it doesn't block the wind at all.
Credit: Cam McKenzie Ring


This jacket retails for less than our Editors Choice, making it an attractive pick for the price.


The Rab Nucleus is a lightweight technical fleece that stands out for its great breathability and features. Consider it as a low-priced technical fleece that'll perform for all winter, fall, and spring days. Even wear it on cooler nights in the Summer.

Rab Nucleus Hoody - Women's fleece jacket - this jacket is fairly plain, which we don't mind. it doesn't look...
This jacket is fairly plain, which we don't mind. It doesn't look too technical or "muppet-like," and it comes in some nice color choices.
Credit: Scott Ring

Amber King & Cam McKenzie Ring

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