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I'm not sure of all the details (bought HJC myself), but I've read that Arai has multiple liner options to fit your head/face in a more customized way, and one of the two allowed you to mail your helmet back for an xray inspection after a small drop to certify it as still good or not.
If I were going on a track or doing more serious things, I might invest more into it. But I got a helmet that fits well, feels comfortable and is DOT & Snell so that is enough for me right now.
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