My horses breed designed these, you cannot buy them online or from horse stores because we don't sell through them/online, but you can order and I'd be happy to post one out ..
They've had 4 years testing, absolutely no sunburn, amazing protection, used in paddocks small and large with no issues, horse CAN breath, if wet the material doesn't go up the nose (tested under supervision).
I am in Australia if you're interested.
I use those on extreme days.. for the non extreme days I use a fly mask and I have a specially designed nose (goes down the side of the nose also to protect)
Have to get a photo for you.
My boy has a blady face, pink nose and pink around the eyes so I am very careful with him.
If I go out and about I pop on some sunscreen, I use a product called Filtabac which is waterproof (like running water off a ducks back)!