balaclava polypro hoods. Keep warm and stay comfortable with a light-weight polypro cold weather hood. Polypropylene helps you stay warmer by "wicking" away moisture build-up from your body during intense activity. Today's modern soldier uses polypro as his first layer of protection from cold weather environments. Don't be fooled by "knock-offs". These are made to military specs by government contractors. Superior quality and comfortable fit. New.