Ultra-tough Polycarbonate frame Harley riders have worn The Original KD"s since the 1950"s making them the #1 selling biker sunglass in the world. KD"s are lightweight, have long slim arms for better peripheral vision, and fit comfortably under a helmet. The Original KDs have a die-hard following that help to make them wildly popular with the motorcycle cycle crowd and beyond. The ultra-strong polycarbonate frame makes it one of the most durable sunglasses on the market. All lenses meet ANSI Z80.3 general purpose UV requirements.