I personally cant get it to work because of my head shape. I have a long head and helmets barely fit me in general. Especially cause I have Smith I/O gogs and they have that huge plastic clip in the back which digs into the back of my head. Idk how people fit a beanie under the helmet too.
buy a helmet a size too big (which renders it pointless) then loosen all the straps to the max they can go (to increase the uselessness), then wa'la you can look like an x-games rider. (unless they are sponsored by oakley it seems).