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Even when it's brutally cold outside, the Men's Under Armour Base 4.0 Leggings will allow you to thrive as well as survive. That's because UA Base 4.0 technology delivers heat like no other fabric, keeping you warm even in the teeth of the fiercest storms. The soft, brushed negative-grid interior of these leggings traps your body's heat and keeps you comfortable in extreme cold. Designed for a fit next to your skin but without the squeeze, these leggings feel as good as they look. Four-way fabrication provides full freedom of movement for strenuous outdoor activities. Under Armour's Moisture Transport System wicks sweat away from your body, keeping you dry no matter how much you exert yourself. Anti-odor technology stops the growth of odor-causing microbes in their tracks, ensuring a warm welcome when you get back inside. A performance elastic waistband and working fly provide 24-hour comfort.