Good Wiki page on Balaclavas. Not only can it warm the air that goes into your lungs just a bit, it also keeps your face warm. A cold face can apparently trigger exercise-induced asthma.
This model is available at quality fly fishing retailers. Bought mine in Jackson, WY before a 5-hour highway ride on a Harley in very cold temperatures.
Great review/info Steve - thanks! I'm going to look for one of these :–)
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