Another lesson I have learned it to stay hydrated to the max. When you do this your body has the maximum amount of blood improving circulation to key areas, in particular the core body parts. The one time I had serious hypothermia, I drank a quart of cold water, ate a bunch of carbs and it helped immensely. When cold, hydration is often not considered, it is easy to back off water especially if it is cold. Big mistake. Drink lots of water and snack.
My lesson was learned the hard way for sure.
The World is my country, all mankind are my brethren, and to do good is my religion.