Isn't the "After-drop" mentioned at: http://www.hypothermia.org/hypothermia.htm caused by cool blood returning to the core and re-cooling it, causing a relapse after hypothermia treatment has begun? "Avoid having the victim assist with their own rescue! Muscular activity by the hypothermic victim pumps cold peripheral blood from the arms and legs into the central circulation causing the core temperature to drop even further." A hypothermia kit would need to account for this issue.