There was a company in Australia that used fabric specifically for UVA/B.
Another company out of Seattle or Portland made Jerseys with it.
(can't remember the names, and I think the jersey company went out of business.
UVA/B clothes do exist, but they are difficult to tell apart from the scam companies.

Better UV protection requires better material and tighter weave.
Getting better UV protections requires the sacrifice of more heat retention (although they still wick moisture pretty well)
So, on a hot day, you will feel REALLY hot until you get a good sweat going.

The ones I have work GREAT at protecting me (super pale) from the sun in the lower latitudes, all day MUCH better than sun screen.

Found the company, but it's only is OZ now.
and their product has changed drastically.
https://sunprotectionaustralia.com/p...-cycling-shirt

Remembered another:

https://www.coolibar.com/