The distinctive style of these sunglasses goes back to the 1950's and Harley riders throughout the world made The Original KD’s the #1 selling biker sunglasses in the world. They stay on your head and keep the wind out of your eyes by fitting tightly on the temples and nosebridge and - most importantly, they look cool. KD's are lightweight, have long slim arms for better peripheral vision, and fit comfortably under a helmet. The strong polycarbonate frame makes them very durable, which is underline by wire-reinforced temples and metal hinges. All lenses are made from polycarbonate and meet ANSI Z80.3 general purpose UVA/UVB and impact resistance requirements.