What's the most durable fly mask that you've come accross? I'm in the market to buy a few, and the ones that I currently have do not hold up well outdoors. I've never put them on during turnout until recently; I have one horse that seems like the flys are just attracted to him and his eyes.
We've always had good luck with the Professionals Choice fly masks and we use them daily.
I guess I should add, one of the PC fly masks we have is at least 4 years old and the only damage is has is a 1/4" spot where the mesh frayed out from under the edge piping. All of ours get dirty and washed often and they hold up great.