The Adidas Sunglasses (cycling glasses) I use for driving are great, as used for the Douro Valley run.
But, I was wondering if they could be 'improved'...
And yes, it seems the can!
With the aid of a hairdryer (don't tell the wife...) and an old can, just a bit smaller than my head, the glasses now have a near perfect fit.
It seems the plastic they are made from will easily re-shape with a little heat - noting too hot.
So I 'pinned' them to a small can (paint tin) of roughly the correct size/shape, and just ran the hairdryer over them (with the lenses and nose bridge removed).
The fit is now near perfect - almost like fitted goggles.