Quote Originally Posted by ForresterModern;
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As Sir Daniel says, things like your kilt socks, head coverage and choice of shirt probably have a greater effect on your temperature tolerance.
That is so true. The core of your body (torso mainly) is where much of the heat is generated. The kilt only covers a smallish proportion, so the heat needs to escape elsewhere, arms, legs, and most importantly, the head. I wish I had some of the research photos I took years back with infra-red film. Humans are a batch of "hot-heads". I forget the portion, but I seem to remember that more blood flows to the head than to any other part of the body except the lungs.

That is why round people can withstand cold better than the skinny types, less surface area for the volume. The reverse would also be true for heat.