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Under Armour has created the concept of Under Armour Technology in which their apparel uses a combination of fabrics and fits to offer a specific functionality for its end-user. The vast quantity of clothing technology they have created is astounding but can be a bit confusing at times.
So when exactly do you need HeatGear® versus ColdGear®, or compression versus loose fit? We’ve decoded the Under Armour Technology for you!
HeatGear® is worn to feel cool, dry and light during periods of high temperatures. Clothing that traps heat causes your body temperature to rise. This could lead to heat-related illnesses such as heat stroke.

On the other hand, ColdGear® is worn to feel warm, dry and light during periods of low temperatures. Dressing in layers that protect your body from frostbite and hypothermia is so important for safe physical activity in the cold.
There’s also a fabric called Charged Cotton® which is a “cotton-rich tri-blend fabric [that] has a soft, athletic feel for superior comfort and performance.” This fabric blend is lightweight, soft, and ideal for a wide range of motion.
Under Armour has also created a water-resistant technology called UA Storm. “UA Storm technology repels rain and snow and keeps you dry” and is frequently combined with ColdGear® technology to create the perfect winter apparel. There’s also a variety of accessories like backpacks, duffle bags, gloves, and hats that use UA Storm technology to keep you and your stuff stark dry.
Another great feature that most, if not all, UA products have is their Signature Moisture Transport System. This “sweat-wicking technology pushes sweat away from your body to the surface of your gear so it dries faster.” UA Tech™ is also a very quick-drying fabric. It is “ultra-soft and has a more natural feel” for maximum comfort.

The fit of your gear can also have a huge impact on your overall performance. The range of motion that you need, how much and how quickly you’re actually moving, and your overall comfort level all factor into the right fit for you.
When you need a wide range of motion with little resistance, choose the tightest fit available, compression fit. The compression fit is described as an “ultra-tight, second skin fit.” This ensures your clothing stays in place and out of the way for intense speed.
The next level of fit is fitted, which is described as “next-to-skin without the squeeze.” This fit still gives you a full range of motion but it is not as tight at the compression fit. This may be considered a more comfortable fit for some people.
A level up from fitted is semi-fitted, which is “a slimmer, athletic cut.” Usually items such as sweatshirts, jackets, and t-shirts are available in this fit to allow for layering and less demanding movement.
The last level of fit is the loose fit, which is a “generous, more relaxed fit.” This fit is also popular for sweatshirts, jackets, and t-shirts with a more adjustable, oversized features perfect for layering and maximum comfort.