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Dr Skinner wrote: This is a similar question to that of those funny foil > blankets people wear at the end of the London Marathon. I assume they are > supposed to prevent people cooling too quickly (why ?) but surely a woollen > blanket would be better. We are not heat lamps radiating heat; we are hot > bodies convecting and conducting to the environment. > We lose heat by conduction, convection, radiation and evaporation. The amounts depend on the circumstances. The foil blankets are probably over- rated and I agree, a nice woolly (warm when wet with sweat too) and a windproof layer would work better. The foil is windproof though. Only real advantage is that foil is light - so good for carrying for emergent situations - not necessary when have families/friend available to watch one puke with pain after 26 miles :-) Jel