I've done a bit of research but can't seem to find much information on how neck braces actually work to protect the neck. There are many views on whether they are actually effective in reducing serious injuries (in the same way it took a long time for ski snow board helmets to be proven).
Neck Braces are a recommended safety item by the UCI for downhill events, unlike full face helmets which are mandatory, but all racers wear them.
What do they protect and how do they do that?