Let me start off by getting right to it: I love these glasses! If you're keeping up, this is the third pair of XX2i glasses I have tried out. I'd go as far as to say they are my favorites of the three. I really enjoyed the Hawaii1 sunglasses (until they got stolen...) because they were excellent to wear while active. The Brazil1 are part of XX2i's casual line, so they aren't specifically built for active situations, but I found myself wearing them casually and while running.
One of the first things I noticed is that they were quite reflective from the outside. The frames are similar to what I've seen brands like Oakley put out. Being a somewhat stylish gay man, I don't necessarily find myself in Oakley's target market, so I was unsure how the Brazil1 would look on my face. Basically, I was all wrong. They fit my face quite well, and by looking at photos of other BibRave Pros who also tried these out (both men & women!), they look good on anyone!
The next thing I noticed is how feather-light they are. The other day I had started a run and it was sunny, but by the time I was in my final miles, it was getting dark, and I held the glasses in my hand for that short time (I hate when running tights don't have pockets!). Not only were they so light that I barely realized I was holding them, but I also noticed how durable they were designed to be. I was holding them, hands all sweaty, and perhaps at times gripping moderately hard, and they took the abuse like a trooper. Just another reason why I said I think they are good for wearing during activity as well.