Under Armour Men's Base 4.0 Long Sleeve Base Layer Shirt - Meet the all-new UA Base—delivering the same trusted warmth without the bulk—now softer and smoother than ever for unmatched comfort on every adventure. UA Base 4.0 Extreme Baselayer is their warmest yet, delivering extreme warmth in the extreme cold UA Scent Control Technology to keep you undetected in all pursuits Material wicks sweat & dries really fast 4-way stretch material moves better in every direction Updated fabric with improved stretch is softer & smoother for maximum comfort and easier layering Generous ½ zip front makes for easy layering Style: 6005299