In reply to Michael Gordon:
Well a stimulus for this article came from a recent debate on UKC..
This is from a Brecon Beacons survival expert.. he teaches courses in outdoor survival so did an article on 'staying safe in the sun'..
"and how to deal with it…
First and foremost, drink as much liquid as possible.."
He's later right when he says about getting in the shade.. removing layers etc.. but it just highlights how, even for supposed experts, drinking and heat and intimately linked, of cause being dehydrated will make this worse but it is more complex than that. He really put the emphasis (first and foremost) on the hydration..
Yeah, I like having a light weight cap if in the alps.. dunk in every stream and put it on.. keeps your head cool..
Its interesting reading about this heating spikes. There was report of one buy in an ice bath whose body was still getting hotter..