UA Base 4.0 Extreme Baselayer is our warmest yet, locking in your body\'s heat to deliver extreme warmth in the extreme cold|UA Scent Control Technology to keep you undetected in all pursuits|Soft, brushed grid interior traps air against your skin, closely managing your body\'s microclimate to keep you warm & comfortable|Material wicks sweat & dries really fast|4-way stretch material moves better in every direction - Style #: 1353351|78% Polyester/22% Elasterell|Imported