The world's most in-depth and scientific reviews of outdoor gear

Under Armour ColdGear Reactor Run Funnel - Women's Review

a breathable, comfortable winter layer with an excellent collar.
Top Pick Award
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Price:  $90 List | $58.99 at Amazon
Pros:  Breathable, great features, comfortable
Cons:  Expensive, boxy fit
Manufacturer:   Under Armour
By Lauren DeLaunay ⋅ Senior Review Editor  ⋅  Feb 14, 2019
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70
OVERALL
SCORE


RANKED
#4 of 6
  • Comfort - 30% 8
  • Breathability - 30% 6
  • Drying Time - 20% 6
  • Features & Versatility - 20% 8

Our Verdict

Living in California, we get pretty used to sunshine and a warm breezeā€¦ until the winter comes. And that's when we realized our current running shirt review just wasn't going to cut it! This winter, we added two long-sleeve options for those of us who just can't stop running when the temperatures drop. The Under Armour ColdGear Reactor Run Funnel, aka the "Reactor," is an impressive layer, combining breathability with comfort and a load of awesome features. It is a bit pricey, to tell you the truth, but we just couldn't compete with this shirt's winter compatibility. The Reactor wins our Top Pick for Winter Workouts, so let us tell you why!


Compare to Similar Products

 
Awards Top Pick Award Editors' Choice Award  Best Buy Award  
Price $58.99 at Amazon$49 List$39.50 at Amazon$22.98 at Amazon$23.80 at Amazon
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Star Rating
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Pros Breathable, great features, comfortableBreathable, comfortable, lightweightBreathable, sun protectionComfortable, affordable, breathableSoft, quick to dry, inexpensive
Cons Expensive, boxy fitExpensive, not as stretchyExpensive, problems with fitLess durable, heavyLess breathable, no features
Bottom Line a breathable, comfortable winter layer with an excellent collar.An incredibly breathable, comfortable shirt that's made for the trails.A great technical running shirt that excels in warm weather.A comfy, breathable shirt at an excellent price.A simple, comfortable shirt without the features of many of its competitors.
Rating Categories ColdGear Reactor Run Funnel Patagonia Airchaser - Women's Motus Crew SS Marmot Aero - Women's Brooks Distance - Women's
Comfort (30%)
10
0
8
10
0
8
10
0
6
10
0
7
10
0
8
Breathability (30%)
10
0
6
10
0
9
10
0
8
10
0
8
10
0
7
Drying Time (20%)
10
0
6
10
0
9
10
0
8
10
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7
10
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7
Features & Versatility (20%)
10
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8
10
0
7
10
0
8
10
0
6
10
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5
Specs ColdGear Reactor... Patagonia... Motus Crew SS Marmot Aero -... Brooks Distance -...
Weight 8.2 oz 2.2 oz 2.7 oz 4.0 oz 3.8 oz
Material 86% polyester, 14% elastane 100% polyester 100% polyester 90% Polyester 10% Elastane AirExchange Jersey DriLayer 88% recycled polyester/12% lyocell
Seam Type Flatlock Taped and flatlock Flatlock Flatlock Overlock

Our Analysis and Test Results

Performance Comparison


What's better than a winter run in Bishop  California?
What's better than a winter run in Bishop, California?

Comfort


Comfort can mean different things to different people, but the Reactor received unanimous praise from our testers. The soft materials, stretchy fit, and comfy collar won it a high score, but its boxy fit and short torso docked it a couple points.


The Reactor's polyester/elastane blend was much cozier than the vast majority of its short-sleeve competitors. If you don't need something mega warm, but you do need long sleeves to protect your appendages on winter days, the Reactor might be the perfect layer for you.

This shirt is super stretchy, much more so than our summer layers. The Reactor does have flatlock seams, something our testers truly obsess over, and we always appreciate when a shirt's seams are removed off the top of the shoulder to prevent chafing or rubbing when wearing a pack.

You don't have to worry about wind sneaking in the Reactor!
You don't have to worry about wind sneaking in the Reactor!

The shoulders and upper torso have an athletic fit, but the bottom was a bit strange. This shirt flares out around the waist, which we found less than flattering. Additionally, it was short, and when we stretch our arms upward, our stomachs become exposed and a cold breeze slipped on.

Breathability


To be fair, when we decided to add two winter layers to this review, we didn't expect either of them to be as breathable as their lighter counterparts. That being said, we were pretty impressed with the Reactor's ability to keep us dry and warm at the same time, something that's hard to come by with any base layer!


The Reactor has some great paneling, our term for describing a manufacturer's decision to methodically apply different materials to different parts of the body. Reaching from the underarm down the side, this garment has a lighter material to help heat escape. Our testers agreed that the Reactor is very breathable, so if you're looking to crank up the volume on a cool day, this might be the better choice.

Is your workout heating up? Not with the Reactor's genius underarm paneling!
Is your workout heating up? Not with the Reactor's genius underarm paneling!

Drying Speed


During our months of hands-on testing, we realized that shirts really have two things going on that are working simultaneously to keep us cool, dry, and comfortable: breathability and drying time. Breathability, as we described above, measures how well a shirt lets heat and moisture escape. Drying time, on the other hand, tells us how quickly a shirt wicks away moisture once it has been saturated.


The Reactor was both breathable and a fast dryer, thanks mostly to its lighter material and lack of fleece. Its polyester fabric dried impressively quickly. This is absolutely key to keeping us from freezing during a winter workout. When a shirt gets wet and takes too long to dry out, that moisture makes us cold the moment we stop moving or when a breeze catches up to us. If your winter workouts involve high-octane activity, there's no denying why the Reactor is our Top Pick for Winter.

Take a close-up look of the Reactor's interior (below) and exterior (above).
Take a close-up look of the Reactor's interior (below) and exterior (above).

Features & Versatility


We've already reviewed women's base layers on the site; in this category, we wanted to find the products that were truly meant for running. To do this, we asked runners near and far what features are included in their favorite garments. Our team, then, awarded extra points for shirts with reflective logos, sun protection, odor control, and, in the case of our long-sleeve products, excellent thumb loops.


The Reactor is an excellent shirt for running, thanks to its reflective (albeit small) logos on the back and front. The thumb holes on this shirt were low-profile, but not as comfortable as we could've asked for. That being said, we're very glad that any thumb loops were included.

Showing off the Reactor's lighter internal collar and its heavier layer with drawstring.
Showing off the Reactor's lighter internal collar and its heavier layer with drawstring.

One of the winter-specific features that this shirt has is a funnel neck. Not quite as tight as a turtleneck, we adore the way the Reactor keeps us warm without constricting our movement. This shirt's funnel is actually twofold: on the inside, there is a light, mega-breathable layer that can be pulled up over the face and nose. This layer is unbelievably stretchy. Surrounding this layer is a heavier one, made of the same fabric that is featured on the torso. The piece has a drawstring closure which is a true rock-star at keeping wind from slipping down our shirt. The combo of these two layers is truly innovative.

Best Applications


Despite being on a mission to find the best winter running shirt, we're happily walking away with one of our favorite pieces for any winter activity. The funnel neck is a great compliment to skiing or traveling in windy places. The breathable material makes this shirt just as great for running as it is for hiking, cross-country skiing, or climbing. Let's be real: you can take the Reactor just about anywhere.

While we're thankful for this shirt's thumb loops  the design wasn't our favorite.
While we're thankful for this shirt's thumb loops, the design wasn't our favorite.

Value


We knew there would be a downside. Despite an incredible performance, the Reactor is one of the most expensive running shirts we've tested. However, if you really need a technical winter layer to wick moisture and keep you warm and sweat-free, this shirt just can't be beaten.

Conclusion


After miles and miles of running, hiking, and skiing, we knew one thing: the ColdGear Reactor from Under Armour is a top-notch piece of outdoor equipment. If you're in the market for one do-it-all winter layer, look no further than our Top Pick award winner. With excellent comfort, superb breathability, and an expertly designed neck, the Reactor is worth every penny.

Thanks to the Reactor's reflective striping  we can keep running long after the sun sets.
Thanks to the Reactor's reflective striping, we can keep running long after the sun sets.


Lauren DeLaunay