Hi Guys.
I manufacture transparencies

I really believe in changing sunglasses to match conditions.

First, I hate the idea that you can't lighten a canopy on a murky day.

Second, I feel that tinted canopies are a hit and miss quality issue.
Think for a minute about how the canopies are made. A flat piece
of material is stretched either by free blowing or in contact with a tool
surface. This produces areas of flow that make the canopy thinner in
some places than others. The non-uniform thickness means some places are
darker
than others as tint values are depth dependant.

If you are getting roasted in Arizona, stick a piece of dark green cling
film tinting
to the inside of the canopy above your head. You dont spend a lot of time
looking straight up
so the abrupt change from light to dark will not matter, and the temps will
still drop dramatically..

Scott Correa
Spektr Products.