The Under Armour Men's UA Base 4.0 Crew Shirt is built for extreme cold and low activity when staying warm is mission critical. The soft, brushed grid interior traps warm air while managing your microclimate for consistent comfort. UA Base 4.0 is Under Armour's warmest baselayer yet and includes Scent Control Technology to help keep you undetected. Sweat-wicking performance and 4-way stretch ensure you're dry and mobile.
Stack up on tactical must-haves and score
UP TO $9.99
Mission Made Men's Long Sleeve Combat Shirt
$34.99
Mission Made Men's Performance T-Shirt, 3-Pack
$29.99
Mission Made Quick Release Tactical Belt
$19.99
Mission Made Tactical Cap
$9.99
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Mission Made Men's Full Zip Fleece Jacket
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Mission Made Men's Soft Shell Jacket
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