The Under Armour Men's Packaged 4.0 Quarter Zip Base Layer Shirt delivers both comfort and heat rention. The soft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortable. FeaturesUA Base 4.0 Extreme Baselayer is UA's warmest yet, delivering extreme warmth in the extreme cold4-way stretch material moves better in every directionMaterial wicks sweat & dries really fastSoft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortableUA Base 4.0 Men's 1/4 ZipUA Scent Control Technology to keep you undetected in all pursuitsMen's 1/4 ZipGenerous 1/2 zip front makes for easy layering