I've been looking for a pair of sunglasses to wear while running.  I live in the southwest and I couldn't endure the glare anymore.  The problem I have is that I have a small face.  Glasses are always falling off my face.  I really should be wearing kid glasses, but they look ridiculous on me.  I want a nice pair of sunglasses for running, but I don't want to spend a lot of money on something that won't fit my face.  I took a chance and order the Tifosi glasses.  I've used these glasses about four times.  One three miler, two four milers, and a five miler.  They stayed on my face and the lenses did not fog up.  The tint on the lenses provide enough protection for the glare.  I'm just impressed they stayed on my face.