Many thanks for your long-standing support, and glowing endorsement
We are indeed about to launch our men's underwear (undershorts) line:
https://ribbedtee.com/hellojewels/
Sadly for the OP, we are not immediately planning an underwear brief.
We are starting with boxer briefs, and will likely add an additional longer inseam length first, then consider adding briefs.
Our launch product is utilizing our 146 gsm CoolNylon+Spandex stretch interlock fabric, which is pretty incredible, in 4 colors & 2 contrast stitch colors (8 variations in total).
For those inclined "Nylon" is also referred to as polyamide & microfiber in the underclothing category. It also has at least 100 other trademarked names, one of which is Meryl (from Nylstar).
It is abrasion & odor resistant, and has a silk-like hand-feel.
We'll be adding the same profile in our TENCEL+Spandex fabric relatively soon as well.
Regarding briefs, I unfortunately wouldn't be able to make any recommendations as I have not worn briefs in over 30 years.
What I can tell you is that the following brands are generally in the current conversation about men's underwear (in no particular order):
1. Uniqlo Airism
2. Saxx Underwear
3. 2UNDR
4. Mack Weldon
5. Tommy John
6. MyPackage
7. MeUndies
I welcome any questions