What's it do?
The Men’s UA Base? 4.0 Crew was built to battle nature’s coldest and most brutal conditions. Its patented negative grid fabric traps heat in tiny pockets to keep you ridiculously warm without feeling weighed down. It wicks away excess moisture in its unique grid channels—keeping you dry and comfortable no matter how hard you work. You can also move with unrestricted ease thanks to UA's super-stretchy fabrication. Facing insane temperatures? Get the performance crew that makes more sense—and delivers more warmth—than anything else out there.

THE FUNDAMENTALS

UA Base? 4.0 delivers heat like no other, keeping you warm even in the brutal cold
Soft, brushed negative grid interior traps hot air, providing superior warmth
4-Way Stretch fabrication allows greater mobility and maintains shape
Signature Moisture Transport System wicks sweat away from the body
Quick-dry fabrication keeps you light and comfortable
Anti-Odor technology prevents the growth of odor causing microbes
Raglan sleeve construction and flatlock stitching allow a full range of motion without chafing
7.5 oz. Polyester/Elastane
Imported