Methodologies to stop the progression of hypothermia do require some additional kit such as a waterproof clothing and high thermal insulation to deal with the conditions that can be expected. As Ray Mears rightly points out the most dangerous temperatures for hypothermia exist where there is liquid water present (which can remove heat from the body much more efficiently) especially combined with wind chill can rapidly cause on the onset of hypothermia. So materials such as Goretex shell clothing and bivi bag etc combined with either down or primaloft insulation and the ability to produce warm and nutritious drinks and food are required. The signs such as shivering, slurred speech, fuzzy thinking and lack of hand dexterity (such as not having the ability to get a match out of a box of matches) are indications of the onset of mild hypothermia. The number one rule of not getting clothing to wet out in cool/cold conditions in the first place should be taken seriously and if this was unavoidable then remedying this situation should be a number one priority.

http://www.youtube.com/watch?v=c_Vxxbh6Czg