How do you know which coats keep you warmest? NASA technology is now being used in coats. Jackets are being outfitted with Omni-Heat, Thermoball, infrared and Turbodown technology. But does it really work to keep us warm? And is it worth the price?
Four coats get the cold weather challenge.
With a thermal imaging camera in hand, Fire Captain Rusty Schaefer can see exactly where heat is escaping someone's body.
Columbia's Omni-Heat features breathable material. Its NASA space blanket technology reflects body heat.
"You're still giving off heat. Not as much as you were before," he says as he points the camera at a tester.