It appears to be an attempt at remedying a problem that i'm not convinced actually exists.
The external hinges would, cause massive issues with grip when sliding, leading it to dig in and cause head rotation. This is why most side-pods and external vents are so flimsy, they are meant to pop off rather than dig in to the road during impact.
However, leaving aside the issues surrounding padding, safety testing etc, Other issues are also pertinent, such as aesthetics and cost. This would presumably cost a fair whack more than it's equivalent quality 'solid' helmet due to the additional processes etc.
Posted: 28/05/2011 at 17:24