I did recently get a set of long sleeved shirts for riding with UPF 50 (spf ratings is for sunscreen 😉).
Even though they are a technical fabric, I do feel like I'll need to acclimate to the heat, since even with short sleeves it can get really hot on long rides.
I haven't looked into the hemp stuff, but I also don't like the idea of synthetic clothing, so I may have a look at more options!
But for my face and neck, Da Brim seems to be a great option.