Apologies if I've missed a previous post on the subject. We know some waitstaff/bar staff who work in hot/humid outdoor summer conditions who swear by these. Being the heat in Europe has been a hot topic lately (pun intended), thought I'd pass the tip forward:
There are any number of other web sources for these; this is just a start.
Have any of you used them, and can vouch (or not) for specific models?