Definitely would love to have a shirt that self cools. I live in Texas and it's hot 95% of the year.
I'm from Colorado, but it does get pretty hot here sometimes even though people wouldn't think so. If a shirt can self cool, then it's safe to assume it can self-warm as well. So, I'd like both.
i have visited colroado in the summer and man it does get hot. You are so close to the sun there