I've seen many recommendations for ExOfficio underwear for men and was considering them. Then I saw a review suggesting the Duluth Trading Co. brand was pretty similar to ExOfficio. And, of course, we're all constantly inundated with those TV commercials for the stuff, so I finally decided why not.
Full disclosure: I turned in my tighty whiteys a few years ago, and have a drawer full of Adidas briefs in various cuts and materials, none of which were perfect, but all better than the old stuff. On our first "packing-light" trip abroad last year, I took briefs in a polyster/spandex blend. They washed well in the sink and dried overnight. But they got sweaty fast and weren't as comfortable as I'd have liked. At the same time, I love my ribbed-cotton tank undershirts. And those do, indeed, get sweaty, wet and stinky in a hurry, while not sink washing well at all, taking a long time to dry, plus taking up a little extra bulk in the carry-on.
I'd been trying to find a lighter, quick-drying undershirt that was comfortable in local stores, but no luck. Hence, my interest in the highly recommended ExOfficio brand. As noted above, I ended up trying Duluth Trading "performance" underwear instead, and am now hopelessly converted. I mainly wanted to try the tank undershirts, but figured I'd throw in some briefs, too. The material is a nylon/spandex diamond weave, and I love it. The briefs at first feel quite snug, but the material is very stretchy and would likely accommodate a variety of, um, sizes. Just as the commercials claim, there's no pinch, no binding, no riding up or slipping down. The "no stink" claim appears to be valid, as well. There's a fully functional fly, which, for some reason, not all men's underwear includes anymore. I intended to use these just for travel, but they have now worked their way into everyday wear and that drawer full of Adidas is going to get cleaned out. I'm afraid I'll need to buy more soon. The company also sells boxer briefs and other cuts in the same material.
I like the undershirts, too, but will probably reserve those for travel, as I still prefer my cotton tanks for everyday wear. When traveling, though, these will take up less space and weight. I did a test sink wash and hang dry of both the briefs and the shirts, and they passed with flying colors.
The stuff isn't cheap. Four pairs of briefs and four undershirts were $140, on sale with free shipping. Sorry if I sound like a commercial here, but I can't recommend these enough for guys who want to travel a bit lighter and comfier.