The Under Armour Men's Packaged 4.0 Base Layer Shirt features a soft, brushed grid interior that traps air, managing your body's microclimate to ensure both warmth and comfortability. FeaturesUA Base 4.0 Extreme Baselayer is UA's warmest yet, delivering extreme warmth in the extreme coldMen's Long-Sleeves4-way stretch material moves better in every directionSoft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortableUA Base 4.0 Men's Crew neckMaterial wicks sweat & dries really fast