An emergency blanket should never be considered the first line of defense against the elements. But as a hedge against worst-case scenarios in the woods or during natural disasters, a basic survival blanket could be the difference between staying alive or perishing. Hypothermia is one of the top killers in the outdoors, and a Mylar or Mylar-coated blanket reflects body warmth back to the individual, dramatically reduces heat loss and increases the chances of survival. In addition to keeping you warm, there are countless uses for an emergency blanket, depending on its weight and construction. Here are but a few.