I bought these Gascans to wear with my Arai helmet. I have had trouble with many other brands stems hanging up on the helmet padding (by the ear). These slip in without any interference and are extremely comfortable.

The polarized lens is a bonus around water but at times refract light through helmets wind screen (causing dark spots).

As I said before, I bought these glasses to wear with the helmet but now I wear them exclusively. They have replaced my Bolles, Ray-bans and Serengetis.