Nope, I do not have long hair, so that had nothing to do with it. I changed the locking mechanism of the piri-helmet since the original one was veryvery frustrating, took me too much time to get the helmet open and/or closed again. I changed it with some ski-binder-like devices, and the evening before, people looked at it and even said: wow, that sure won't go open 'just like that' (they even could not figure out how to open the buckels). But then the next day, perhaps because one of the clamps was not closed completely due to a hurry-exit I had to perform, the helmet snapped open and there it go.... down to earth. I sure would like to see that film... but we never found the helmet AND camera. So at the end it maybe was not the original closing device that failed, but because of a frustrating original device, I did change it... A big difference with the flat top pro is also that you have to close it completely with your own force (I do not knwo how to explain...) with the flat top, I can loosely close the helmet, and with the clamp close it firmly around my head, and even have control over the tightness of the 'fit' With the piri that was not possible. By the way, the thing that I did like on the helmet was the quick release (which also worked with the new closing clamps). My flat top pro has not yet a quick release, although an upgrade is coming soon they say (see another thread in this forum) Caren