I treated my self to a pair of big RayBans last year at a 1/2 price sale .
Now these suckers are large and cover a lot of acreage so never occurred to try them with my convertible helmet.
I had a decent pair of polarized I thought I left in Australia as my helmet here does not have a flip down sun shade.
Could not find the $30 wonders and for kicks tried the RayBans with the helmet closed and shield up.
Fit like it was a custom pair of eye shields. So comfortable. no wind leakage and works with the helmet up or down and sure is a real benefit riding under tropical sun.
Ray-Ban RB 3414 shield style aviators
If you are looking for sun glasses that really cover ....maybe wander by a RayBan outlet and try them...I was completely taken by surprise as they are big and never thought they would fit but the rather thick arms slide right in and are all day comfortable the complete wrap around coverage from glare. Happy rider.
Damn ...the model is discontinued but these seem to be the replacement RB3471
These are closer I think ...there is a shield series .
Ray Ban 55014
No glare at all....really reduces the squint factor in bright sun or those bright clouds day. Makes for a relaxed ride.