
So the drill is that each morning when you shower, just take your briefs with you and wash them. After the shower, wring them out, roll them up in a towel and ring them again, and then just hang them up to dry. In a humid climate, they will still managed to be clean and dry later in the day. In a dry climate, they will be ready in just a couple of hours.
These guys are entirely artificial: 94% nylon and 6% spandex. They're odor-resistant, anti-microbial, and very stretchy. You can also find them as briefs, and I'm pretty sure that ExOfficio makes a whole line of men's undergarments in the same material. I can't say that I'd want to wear an undershirt made of this stuff, though.
I was curious about travel underwear when I first purchased these, and thought that the high price tag (usually over $15) was a bit excessive. However, on this trip I've been traveling with both normal cotton underwear and my fancy space-age ExOfficio underwear, and the latter have outperformed in every way. They dry faster, are remarkably easier to clean, and I'd love to have another pair. The two pair I have, as I mentioned earlier, are three years old and still going strong; my normal underwear rarely lasts that long.

And they are dead sexy to boot!