Hi-fi I, you will be missed!
This year R.E.D decided to change the mold of the helmet, making the fit for me somewhat strange. I personally liked the Hi-Fi I better than the Hi-Fi II but they did add features to teh Hi-Fi II That the I did not have.
A lot of people were ripping the ears out of the Hi-Fi I so they made the ears removable. Overall the features they added make up for the Mold change but make sure this thing fits before heading out!
Either way it will protect your goods.