These fit well with a left and right sleeve. They are a little on the long side, but better than too short, They are a good sunscreen and wick well. I live in the desert where it is really hot. It's true that if you get them wet they will be very cool to your skin until they dry - which is within a mile of starting a ride where I live. After that, they do wick away sweat which keeps you cooler and dry. I like that they are SPF 50 - I'd rather wear these then have a sunscreen film. That said - when it's really hot (and I mean 90+ degrees at 6am and 105+ by 10:00, I am about 60/40 wearing these - and less so on a day where the humidity is about 70%.
I've had carcinoma removed from my forearm. So these have become a requirement for me. They fit well and are very light weight. Just what I needed. They work as light weight arm warmers when starting a ride early, then keep me protected when the sun comes up. Keep them damp to keep cool when it gets hot.
Bought these for my wife and we had to exchange them for a larger size. Now that the size is right they look like they will do the job of protecting her from the sun. Won't know for sure until summer.
These are exactly what I was looking for to protect against the sun. They do run small to the point of restricting circulation to my hands. I just had to reorder a size up. But if you have sensitive skin to the sun these will do the job protecting you.
I use these sleeves for shoulder season riding when mornings are cool, but the end of the ride will be warm. They are not bulky like thermal sleeves, but still provide just enough wind protection to keep you comfortable for those times when a jacket is too much and a summer jersey is not enough.
I ride everyday around noon and 3p, so I'm in the sun. Last years (2017) model didn't seem to breathe that well, after a ride it felt like my arms were wrapped in plastic wrap. The 2018 model is much better, it breathe and wicks the sweat. But even after a LONG ride on a sunny day, it still feels good to get the sleeves off. As for sun protection, based on the pale skin after taking my watch off, the sun is still getting through the material, but the arms aren't really dark as compared when I rode without sleeves. I found that pulling the sleeves up the the edge of your riding shirt sleeve, keeps the arm from overheating vs. pulling up to the armpits..