They offer UV 400 protection, they have CR39 lens (lightweight and safe), and they are hand crafted, ISO and CE approved - PLUS they come with a fantastic hard case. Everything an expensive pair of glasses should be BUT they offer all that for $36.00!
That hard case alone is worth the money. I can't tell you how many disasters that case has saved my sunglasses from suffering. AND at that price, I can have a couple pair. One for the purse, and one for the car. Love them!