My quest for the perfect brief was partially incented by dermatologist as a possible solution to....chaffing related issues induced by biking and exacerbated by "normal" heavy cotton briefs, let us say. After getting enough brands, styles etc to likely get both my wife and Amazon wondering if there was a fetish thing going on, I found these.  They are very comfortable for all day wear, even - or especially - when it is 90 degrees and 90% humidity. I will still look around some but will stick within the UA brand - they are outstanding. Pricey, but worth it, especially when the alternatives are ...unpleasant.

Seller / Shipper is not amazon but it arrived early and in perfect condition.