In Praise of Balaclava
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Ounce for ounce the Balaclava is the most valuable layer to have in your pack.
It weights next to nothing and can be worn as a beanie or as a head, face, and neck covering. If it gets really cold and windy, the balaclava is indispensable. It covers the jugular veins in the neck out of which much heat escapes.