I'd like to add this, if you're going from a EXO400 to a EXO500, you might want to go a size up. I myself went from a 400 to a 500 and I needed to go from a L in the 400 to a XL in the 500. EXO500 is also my favorite helmet that I own. I have a FS-15 and its almost never use to because the 500 is just so awesome. Only thing that might make me switch from my EXO500 is a EXO1000 or EXO1100
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