Wow guys love em.
Of the two brands I've tried, this seems to be the far better option:
https://www.amazon.com/LilySilk-Breathable-Mulberry-Underwear-Bottoms/dp/B081YX8JH3/
Discussion
Darn. 7% spandex (plastic) right against your junk.
I would prefer 100% silk also
I had these in the past but they fell apart over just a couple months
https://www.amazon.com/Tara-Sartoria-Artisan-Natural-Mulberry/dp/B0CGJF4XD1/
I just bought Turnbull & Asser boxers (which are 100% silk but much more expensive)
so far I am quite impressed