Unfortunately, sat on a pair of Serengeti Drivers sunglasses. Before renewing them I decided to search the Net for more info. It became very apparent that Revo lenses are considered the best, and they have lense suited to the flying enviroment. Purchased a pair and they do live upto their reputation, much better than the Serengetis or any other sunglasses I have owned. They are expensive but what price do you place on your sight? I can highly recommend them without reservation.