Thermals, as in vertical rising air columns, as in soaring in a sailplane (which reminds me that I will need to re-up my FAA license by August).Not sure what you mean by "ridden in thermals", I have worn them when it gets to be what I consider cold which is much colder than what most people would call cold. Seems like you're on the same page with me on that assessment.
Of course.TPBM has hiked in negative F temps.
TPBM has hiked in >100ºF