Here's the deal guys: I work and live in the Mojave desert. I have recently had a reappraisal and re wardrobe of my entire undo stock. Absolutely the best skivvies for the conditions you describe are Adidas Sport Performance. They come in 3 leg lengths: Trunk, Boxer Brief and 9" midway. They are all close-fitting, but the crotch is tailored such that it doesn't constrict or stifle your junk. THE BEST UNDERWEAR IVE EVER WORN IN HEAT OR OTHERWISE. I collect underwear like some of you guys collect DE's, so I know what I'm talking about. I have Calvin Klein, Champion, Body Glove, Uniqlo, Penguin, and Adidas owns them all! Kohl's sells them at a buy one get one half off pricing, so you can score 4 pair for around $36. Not cheap, but an excellent value. Marshall's, TJ Maxx, and Ross sometimes have them priced singly or in doubles for $6-$7 a pair. Cotton is widely believed to be the go-to fabric for hot conditions, but the current state of technical fabrics has far surpassed it in terms of moisture and odor control, as well as personal comfort.
Ummm. I checked these out and I'm thinking that the people who wear these don't pee? Totally unzip, unbelt, to pull down at the waist to pee? Is that how it's done? What's with that?