Who sells the Darn Tough equivalent of underwear?

For those who don't know: Dark Tough sells high quality and really tough socks that take forever to wear out or develop holes. They're made in the USA and have a no-bullshit lifetime warranty. I bought my first pair over a year ago. It's actually kind of crazy that I put up with shittier, cheap socks for so long. I'm never going back.

And now, the ol' underwear are starting to get some holes in them. The kind of holes that let the breeze tickle your balls.

Unfortunately, while searching online for the Darn Tough equivalent of underwear, I found a lot of counter-recommendations. Someone would recommend a brand (like Duluth), but then someone else would provide a pretty detailed account of why and how that brand's underwear apparently sucks now, or they don't honor their warranty anymore, etc.

So, I thought I would ask for recommendations on Tildes, since I generally trust the judgement and reviews of you all more than other people on the internet.