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yes I remember that. I really don't know why riders, with 5 degrees and rain, don't put a cap under their helmets. you lose a lot of warmth from the head
No more per sq. in. than any other part of your body. That being said, I used to wear a skull cap and arm warmers in races below 55 F because cool air going over my arms and head/ears just felt cold (my legs were generating enough heat to feel OK, plus warming sprays help too).

EDIT: I don't know where/how that 'wives tale' started, but notes from a USA military test in the 1950 (?) noted that 'due to the high blood flow to the brain...'. It has to be pretty cold for the heat from conduction escapes your brain, then through your skull, skin, and out (convection, right?).
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