Dealing with the sun can be very difficult when it is at just the perfect angle where a hat is useless. I know it may look odd as it isn't used in soccer, but take a page from baseball or American football and try some eye black. It doesn't block the sun, but takes much of the glare out of the experience. The grease-based eye black stick or the newer press on sticker versions will both work. Some people may give you weird looks, but it will pay off when you aren't squinting and spilling ordinarily easy aerial balls.