Wow, I have no solution ideas, but I did meet a camp counselor like that once, when I was a kid. We were walking around outdoors doing a scavenger hunt, for hours, in 100+ degree humid heat. Everyone else was WET from sweating and this girl was dry as a bone, not even her armpits were moist. She was thin and pretty so she looked like a model or something. Anyway, she said she never sweats! I couldn't believe it!