Best For Distance Running: UA Tactical ColdGear Infrared Base Mock Gear up for a long run with this UA Tactical ColdGear Infrared Base Mock ($60). It uses your body heat to keep your core temperature regulated and is soft on the inside so you don't have to worry about chafing mile after mile. Image Source: underarmour.com UA Tactical ColdGear Infrared Base Mock $60 from underarmour.com Buy Now