I bought an N-317V Nitro flip-font helmet about a year ago, and the other night when I pressed the big red button to release the flip mechanism, it popped stright up and stayed there. I couldn't get it to budge and was forced to get the helmet off normal fashion, which resulted in a nasty gouge in my forehead. Flip-front helmets, it seems, are not meant to be taken off without flipping. I dismantled the front section and found that the two catches are released by a piece of wire which is attached to both catches and is lifted by the big red button. The wire had broken. Before I get the "Well, that's what you get for buying a cheap helmet" mantra, I'm not complaining, just informing other owners (or potential owners) of this design problem, and suggesting that they check the wire now and get it fixed while the helmet is still in warranty (if, of course, it is). If it isn't (mine is) I suggest that with a little ingenuity it could easily be fixed, and probably with a more robust wire into the bargain.