Under Armor's RD team looked to the sky for inspiration on how to make the Men's ColdGear Infrared Evo Mock Top as warm as technologically possible. Nope, it didn't look to the sun, but rather to Stealth Bombers. These military aircraft absorb electromagnetic waves a form of heat with ceramic to avoid detection. You won't go incognito with the ColdGear Infrared ceramic printed interior, but it will capture warmth. Under Armor then one upped the military by adding four way stretch fabric, moisture transport system, and an anti odor treatment to this high tech baselayer.