I have come to terms with the fact that I have a fat head. Unfortunately the sunglasses industry doesn't care very much. I have had really good luck with Zeal Optics brand sunglasses. I have three pairs all with interchangeable lenses. The Blasts are a full coverage, large size mountain bike oriented glasses, but look cool off the bike too. They come in all colors, and have tons of options on the lenses. I really like the cool case they come with, really great products from a company in the legendary Moab Utah. If you have a hard time finding glasses for your really big or really small head, try Zeal.