UA Packaged Base 4.0 Crew

The UA Base 4.0 Men’s Crew is Under Armour’s warmest baselayer, built to deliver extreme warmth in the harshest cold. Its soft, brushed grid interior traps air to manage your body’s microclimate, keeping you warm and comfortable. The 4-way stretch fabric allows for unrestricted movement, while moisture-wicking, quick-drying material keeps you dry during high-output activities in freezing conditions. Perfect for layering in extreme environments.