I clicker-train horses and so spend a lot of time in the sun. I was looking for palm-free sun protection so that I could feed horses out of my hand, and not get the palm of a glove all yucked up with horse saliva. These palm-free gloves (in black so they don't show dirt) really do the job.
I must say though, they're awfully pricey for what they are. (That's why 4 stars instead of 5.)