Under Armour ColdGear Reactor Review

  • Under Armour ColdGear Reactor front
8.8 score
[Editors rating (8.8)] = (WalkJogRun) score (8.8)/10

Editor rating: 8.8 / 10
User's rating: based on 0 user ratings
1 star
2 star
3 star
4 star
5 star
Add your Rating

If you love getting outdoors and going on adventures, you aren’t going to want a little snow and cold stop you. Thanks to beanies like the Under Armour ColdGear Reactor you can get out and do what you love and still remain warm and toasty. This cap gives you an excellent blend of warmth and breathability thanks to the ColdGear Reactor lining that can adapt to your activity level. It gives you an Armour Fleece construction for a soft inner layer that feels great on your head. The UA Strom finish will help repel the snow and rain from the cap and whatever it doesn’t repel won’t keep you damp for long as the outer layer is designed to dry quickly and efficiently. This beanie does have a slightly higher price tag that some of the other ones on the market, but customers welcome the extra cost as it is such a superior product. It is lightweight and thin, yet can keep you much warmer than you expected when you head it. It really is a great winter hat that most consumers love.

Editor's Pros & Cons

Anti-odor technology

ColdGear Reactor lining

Breathable and lightweight

Provides excellent warmth

UA Storm finish


High price tag

Fit a little large


This is a perfect beanie for those who love the outdoors and don't want to let a little cold weather stop them from getting outside and doing what they love. If you're going to get outside for your morning jog or you want to head out to play in the snow with your kids, the Under Armour ColdGear Reactor will be a perfect go-to hat to help keep you warm and comfortable while you're enjoying your time outside.

This is an all-around great beanie for almost all winter weather activities. It is going to keep you toasty and warm thanks to the Armour Fleece construction with a brushed inner layer and a quick-dry outer layer. It features a ColdGear Reactor lining that changes and adapts to your activity level, giving you the perfect blend of breathability and warmth, to provide you with what you need when you need it.


Yes, the Under Armour ColdGear Reactor is a winter cap and as such is designed to keep you warm and toasty. That doesn't mean that it cannot provide you with decent ventilation at the same time. In fact, this uses a ColdGear Reactor liner inside the cap that will adapt and change so you can get excellent temperature control. It gives you what you need, when you need it, whether it's warmth or breathability, this cap can do it all.

You want to be able to stay warm when heading out in the snow and cold temperatures, but when you start to work out, you will begin to warm up a bit. As your body heats up, you will want to take advantage of the breathability so air can flow into the beanie and help prevent you from getting too hot and overheating. It's also going to help lessen the amount of sweat that will soak into the cap, allowing the moisture to evaporate quickly and escape it.


The Under Armour ColdGear Reactor has two different layers so it can provide you with what you need to keep you both warm and dry throughout your adventures. The inner lining is made out of 81% polyester and 19% elastane so you can get a firm yet stretchy material, giving you a perfect and comfortable fit. The shell of the beanie is made out of 100% polyester.

The use of polyester and elastane gives the cap a great feel; it is soft and smooth and gives you that little bit of stretch you need to acquire the perfect fit. These materials are made of super-strong fibers woven together, which are designed to stay together and not rip or tear easily.


Customers can agree that the Under Armour ColdGear Reactor beanie is exceptionally comfortable. Whether you are running errands or running a marathon, this hat is going to feel great on your head and keep you comfortable all day long. It's soft to the feel and has the perfect amount of stretch for a better fit. There were some customers complaints about the way it fit, saying it felt a little too loose on them, but for the most part, reviewers were extremely pleased with it.

As previously mentioned, the cap can adapt to your needs, giving the perfect blend of breathability and warmth so you can stay cozy and comfy throughout your adventures. Customers have said that even in sub-freezing temperatures this hat did a fantastic job at keeping their ears and their head toasty.


One of the biggest problems that customers have with the beanie is the way it fits. It is marketed as one size fits all, but that is not always the case. There are quite a few of reviewers said that it feels a little loose on their heads, they suggested that unless you have a large head or a lot of hair, it might be a little too big on you.

Now, the hat does have a little stretch on the inside layer to help accommodate different size heads, but according to many people, it doesn't do much for those with smaller heads. It does fit a majority of customers just fine, but it is worth noting the size discrepancy since there were quite a few consumers who mentioned it.


When you're shopping around for a winter beanie you want to make sure that you find something that is going to last. If you are spending your money on a product, you aren't going to want to turn around and have to pay to replace it because it couldn't keep up with you.

The good news is, the Under Armour hat was designed for those who lead an active lifestyle and as such, can withstand a lot. It's not going to rip and tear if it gets snagged on something, the polyester fibers are strong enough to reduce that kind of damage. This hat is going to be part of your winter weather wardrobe for many seasons.


The Under Armour ColdGear Reactor is a beanie and as such has the same classic style that you would expect from other similar products. It knitted hat with not bill that hugs your head, covering your ears and head to keep you warm in the winter.

There are a handful of colors that you can choose from when ordering so you can try to find something that will suit your style needs. You can choose between Arden green and graphite, black and graphite, black and red, graphite, overcast gray and true ink, raisin red and stealth gray, or stealth gray and magma orange. Something to note about the color options is that, according to customers, the black and graphite cap is not entirely black, it looks more like charcoal or dark gray color with some black threads, so if you want true black then that color is not going to work for you. Regardless of what color you choose, the cap has a raised heat seal UA logo on the front of the hat.


The Under Armour ColdGear Reactor is a little on the pricey side when compared to other beanies on the market. That being said, customers have stated that they are well worth the extra cost. Not only are they durable and will survive a couple of winters, but it is also very useful and is an excellent all-around piece of gear. It can pack up small, so it isn't going to take up a lot of room in a pack. It's lightweight and thin, yet it can keep your head and ears super warm so you can head out for your run or hike without the need of more layers and weight on your head. It's an all around great product that customers love and it is definitely worth the steep price tag.


When you are heading out for your workout you want to try to make sure that your athletic apparel is as lightweight as possible so you are not feeling help back and weighed down. This is especially important when going out in the colder weather since you are more likely wearing more than one layer so you can stay nice and toasty.

The Under Armour ColdGear Reactor is designed to keep you comfortable without the additional weight. You should not need to layer this hat with anything else as it should give you all the warmth you need, even in sub-freezing temperatures. It's thin and ultra light, giving you a barely-there feeling that most runners can appreciate.

There is no information on the exact weight of the product, though, so it's unknowing how heavy it actually is. That being said, customers can agree that it isn't at all burdensome and feels excellent.


You are going to get a decent amount of protection when heading out while wearing the Under Armour ColdGear Reactor beanie. Of course, you will get protection from the cold, as you would expect from this type of hat, but there is more than just that.

The cap features a UA Storm finish that helps repel rain and snow, letting the moisture wick right off the hat, so you remain dry, no need to be stuck in a wet and cold beanie while you're outside in the cold weather. It's also going to help protect you from the cold and moist thanks to the quick-drying outer layer. If you get stuck in excessing rain or snow, the repelling layer might fail and you may end up with a damp hat, although if this happens it won't stay that way for long. The materials will dry rather quickly so you don't have to experience the discomfort of a wet and cold hat.

Another form of protection that you will get that you might not expect from a product like this is anti-odor technology. This is going to help prevent the grown of microbes that cause odor, keeping you smelling fresh. After wearing the cap for a while, it could start to develop an odor, thanks to this technology you can stay cleaner longer.


If you want to keep your beanie in good shape, you are going to want to make sure that you are taking proper care of it. You want it to stay clean and fresh smelling, which can sometimes be difficult if you are heading out for a run in the cold weather, traipsing through snow and muck. The good news is that this cap is machine washable so you can just throw it in the wash and it'll be good as new. Make sure that you are following the care instructions, however, so you don't risk shortening the lifespan of the beanie unintentionally.

Bottom Line

You should not let a little cold weather stop you from getting outside and going on an adventure. Whether you want to go for a daily jog or you need to run some errands, let the Under Armour ColdGear Reactor be your go-to winter hat to keep you warm and comfortable while you're out and about. It is lightweight and thin, but don't let that fool you. This cap can keep you warm, even in sub-freezing temperatures without a problem. The ColdGear Reactor lining can adapt to your activity level so you can get the perfect blend of breathability and warmth so you can get what you need for optimal comfort. It comes in a variety of colors, so there is bound to be something out there for everyone. Something to note is that some consumers stated that it is running a little large, so if you have a small head, this might not be the right product for you. It has a steep price tag, but reviewers have stated that it is worth the extra cost. The features and exceptional durability make the beanie an excellent investment. It would be a welcomed addition to your cold weather gear.