Through some bad luck, I had to replace my sunglasses the week before my first half ironman triathlon. I'd heard great things about these, but couldn't find them locally before I had to leave for the race. I had this site send them to where I was staying and they arrived the afternoon before the race. The glasses fit great (I have a large melon), and don't shift or slip. Optics are great (they are Oakleys after all), with no distortion. They were fantastic for cycling, and I was in a lot of pain during the run so I didn't notice them then, which I think is a good thing. And they say nothing new on race day...