The neighbors used to have a strange mutt, a rott something cross, for some reason it decided one day to lunge at my son and bite him on the head. A buddy of his threw his bike at the dog to get him off my son. My son was bit twice and they put the dog down, but what mazed me was the marks on the oakleys he was wearing. the frames cracked but held and the lense had a huge divot which from where the other bites on his head were was right inline with his eye. so without these glasses holding up, he most likely would have lost and eye.