Mike Patterson, the maker (Images via Traü)

Traü is a new, U.S.A.-made, all-natural athletic underwear brand made of breathable, anti-microbial bamboo that battles sweat. (Here's the brand's history.)

Also interesting: It comes with a 100% money-back guarantee.

I tried this one. It's very comfortable! (And I'm not paid for any of this, BTW.)