I've owned a pair of Oakley Gascans before, and they were, without a doubt, my favorite pair ever.  My original pair was custom-made through Oakley, and with all the simplest options, excluding polarized lenses, they were $220 retail.  So when I found them here on Amazon for as cheap as they are, I was too excited to not click and buy immediately!  Don't listen to the negative reviews unless the price is over your budget outright.

The Oakley Gascan is a perfect fit for people with massive heads, not just for fit, but for the aesthetic.  I hated buying $50 piece-of-crap sunglasses that barely fit, and made the rest of my head look gigantic by comparison.  I highly recommend these sunglasses to everyone who asks.