They have broken MANY a collarbone, that's for sure. There have been so many debates on the MX boards about their worthiness and kids are still dying with them on at a more rapid pace than before they existed. Stewart doesn't wear one and he's wadded more than anyone EVER! I imagine they'd limit your neck motion much more than u'd like riding street.
I wore the Alpinestars one riding dirt and it was extremely uncomfortable as it pressed on the front of my collarbone and hurt like hell.
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