i have tryed different helmets on like tgs,661,bell and pro tec and they fitted fine but i just found them uncomfatable aand anoying but i ride with a beenie on most of the time, found a decription on one, http://www.productwiki.com/d3o-ribcap/
same, to be honest i think you look even more of a dick wen your in hospital but when your with your mates and your the only one with a helmet on then you dont think like that.