The one I have is from REI and made of modal (similar to rayon, made from wood pulp), it’s the only one I’ve used but it feels very nice, soft, and lightweight. I don’t ever feel like I’d be better off not wearing it if I’m in direct sunlight, and sweat dries from it fairly quickly. I’ve been hot while wearing it but not any hotter than I would have been standing in the sun to begin with, you know? I’ve also never had it fail and result in a burn, and my dermatologist was enthusiastic about it when I brought up that I’d been using that instead of sunscreen.

The main reason I went with that brand was because I couldn’t find any non-polyester options anywhere else. There’s nothing wrong with them functionally, I just try to avoid polyester in general.