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UA Base 4.0 is built for extreme cold weather and lower activity. It uses a unique pattern that's designed to trap heat without adding bulk. Think

Under Armour Men's ColdGear Base 4.0 Crew Extreme Baselayer - The

Under Armour Mens Packaged Base 4.0 1/4 Zip T-Shirt

Under Armour ColdGear Base 4.0 Crew

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Under Armour Men's UA Base™ 4.0 Crew

Under Armour - Tac Mock CGI Base T-shirt

Under Armour Tactical Men's ColdGear Base 4.0 1/4 Zip Black

Under Armour Men's ColdGear® Base 3.0 Crew SM

Men's UA Tech™ Team ¼ Zip

Men's UA Base 4.0 ¼ Zip

Under Armour ColdGear Base 4.0 Crew

UA Base 4.0 is a men's baselayer built for extreme cold weather and lower activity. It uses a unique pattern that's designed to trap heat without

Men's UA Base 4.0 Crew

Men's UA Velocity 2.0 ¼ Zip