I too would like a citation. Plus calling a bike helmet&#x27;s foam &quot;flimsy&quot; makes me question your argument. If you&#x27;ve ever removed the outer plastic (which is designed to crumble), you&#x27;d know that the foam is extremely tough.<p>You could likely make the argument that over a certain speed your other body parts will sustain large enough injuries for the bike helmet to not matter, but that&#x27;s not what you&#x27;re arguing, you&#x27;re arguing that the bike helmet itself stops working at an extremely low speed of 23 MpH or above.<p>I actually Googled this a bit. Cannot find anything on it.