What are some effective ways to warm myself up in the cold?

See below.: Pay attention to the head and neck - this can be an area of significant heat loss. Use of wool can be helpful - it can still help to keep you warm even if you become wet. An outer material that will break the wind. Layering is important. Before i went to antarctica - i spent money on some very expensive long underwear. It was worth it's weight in gold as it was rated for very cold weather.