Under Armour men's long sleeve compression shirts are a true performance baselayer. Built from lightweight fabrics that stretch with your every move, our long sleeve compression workout shirts also wick sweat and dry super fast. We've got HeatGear® for warm weather, and ColdGear® for cooler temps.

Under Armour Heat Gear keeps you cool. It is ideal as running gear or even just to wear on those hot summer days. It is made of sweat wicking fabrics which pull the sweat away from your body and allow it to dry off keeping you cool. It is for hot conditions hence the name Heat Gear.

• Style #: 1257468.
• Body: 4.7 oz. 90% Polyester/10% Elastane.
• Mesh: 3.5 oz. 88% Polyester/12% Elastane.

The HeatGear is 100% polyester and the original innovation that the founder of Under Armour came up with. Wearing this is like wearing a part of history! Fitted with UPF protection and anti-odour technology, this is the original classic HeatGear which gives you great value at an affordable cost.

Men's Tactical HeatGear Compression Short Sleeve T-Shirt Compression: Ultra-tight, second-skin fit. Super-light HeatGear fabric delivers superior coverage without weighing you down. 4-way stretch material moves better in every direction. Material wicks sweat & dries really fast.

HeatGear® fabric, with all the benefits of UA Compression, comfortable enough to be worn all day. Stretch-mesh underarm panels deliver strategic ventilation. UPF 30 protects your skin from the sun's harmful rays. 4-way stretch construction moves better in every direction. Material wicks sweat & dries really fast.

In order to easily remember the difference between the two fabrics, just remember: HeatGear is for the HEAT and hot weather, and ColdGear is for the COLD weather.

In terms of fiber use, over 80% of Under Armour's materials are polyester-based (both virgin and recycled), which, by many measures, is more sustainable to produce than alternative fibers. Polyester may also reduce GHG emissions from consumer use.

Wearing compression clothes helps speed up the process of rebuilding the muscles after exercising. These garments help reduce muscle fatigue and increase blood pressure, which is helpful for healing broken muscle tissue and rebuilding muscles. Besides that, the tightness of these products can ease swelling quicker.

Compressing the muscles effectively improves the blood flow in the upper layers of the muscle. Not only does this ensure better oxygenation of the muscle, but also a more efficient venous return. The main benefits of oxygenation of the muscle are directly reflected in its performance, so you improve your performance.

I've found that HeatGear is my preferred base layer in colder conditions. While you might expect a thicker base layer to be more effective, I've consistently preferred HeatGear over UA's ColdGear or a number of other warmer base layers that I've tried. The big advantage of HeatGear is that it doesn't hold much sweat.

UA ColdGear is the optimal “second skin” for cold weather workouts. Under Armour has done extensive research to understand how much and what type of stretch is needed for different areas of the body to keep the fabric in place, as well as comfortable and supportive.

Products manufactured by Under Armour include athletic shoes, t-shirts, jackets, hoodies, pants, leggings, shorts, athletic bras, athletic bags, face masks and accessories such as bags, gloves, caps and protective gear. Under Armour also produces American football, basketball and soccer uniforms, among other sports.

athletic performance apparel About Under Armour Under Armour, Inc., headquartered in Baltimore, Maryland, is a leading inventor, marketer, and distributor of branded athletic performance apparel, footwear, and accessories.