.... or if you fly on an FAA ticket - polarized lenses not allowed
On a different note: can you get the Serengetis with corrective lenses ? I have special bi-focals made with a 'near vison' (i.e. reading) inset that sits a bit higher then usual and is calculated for the distance to the instrument panel. Will need to change these later in the year. For the time being, they live in old Ray Ban Aviators frames, but am open to suggestions - and everyone seems to love the Serengetis !