Also textiles. The solo knit band is a technical marvel. A single 3D knit with embedded mechanical parts and hidden cables to adjust tension. It’s not my wheelhouse but I’d love to read a textiles expert’s take on it.
e: I stand corrected, the reviewers I've watched mostly preferred the dual loop but there's plenty of solo knit fans here. I guess that YMMV factor is why they include both.
As the owner of a long head, I definitely struggled with feeling like I couldn't get the VP to sit right for my eyes with the solo loop. The dual resolved that easily.
Then you get to have the single loop as new fidget toy.