The Extreme Cold Hoods are designed for use with the popular US GI M-65 Jacket and teh Fashion iconic Fishtail Parkas. They are a cotton Nylon blend shell with a wool liner and synthetic fur Ruff to trap snow flakes before they swirl around your ears. This hood is a great add to the Coats and Parkas, for Function and fashion. they button in have a draw cord for a secure fit and a flange to fit under the collar so no wind finds it way down your spine.