An interesting counterinformation is that I have read and heard that the crusades helped promote the development of complex metal plate armour in Europe, as previously to invading the Middle East the (basically) Normans/Germans/etc. had popularly used cuirbolli for the hard plates in their body armour. The story told is that cuirbolli, being hide stiffened by being permeated by molten wax, is quite stiff and hard in Western Europe, but in the heat of Palestine, what are hard waxes in Europe are much softer, and more tend to lubricate a cut.....I have worn a large closed helm in recreation combat and sparring and it does get mightily hot in the Sun. Note that the familiar barbut style ancient Greek helmet (though they actually used many types, varying with individual, region, time, etc.) could evidently be pushed up to expose the face and take air in times when appropriate/safe. Of course, heat does kill, but then, so does a spear or club to the head......
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