The Men's Under Armour 2024 Base 4.0 Base Layer Leggings are the warmest Under Armour baselayer you can get. The Under Armour ColdGear® 4.0 baselayer feature a soft, brushed grid interior to trap in body heat and retain warmth on bitterly cold days. Made from four-way stretch material, the Under Armour ColdGear® 4.0 allows you to move in every direction, while the technology wicks away sweat to keep you feeling dry. The wide, flat waistband sits comfortably at your hips for comfort during any activity. Be ready for the bitter cold with the Men's Under Armour 2024 Base 4.0 Base Layer Leggings.