Here's an interesting test of the coldblack tech:

https://www.runnersworld.com/running...k-does-it-work
TL/DR: summary is that this treatment works on colored clothing - reducing temperature vs. non-treated clothing of the same color by 7-10 degrees. That said, white clothing still performs better. However other benefit of cold black treatment seems to be UV blocking. It's not clear to me if you can have cold black clothing that's white?
https://www.schoeller-textiles.com/e...gies/coldblack