Dang, this was a crazy discussion. The helmets were designed to be fitted to the skull as closely as possible. That’s how they were designed, that’s how they were tested, that’s how the forces are redirected so your brain isn’t turned into jelly. Adding even more unnecessary layers WILL affect all of that, that seems like it should be common sense even if you aren’t schooled in physics.
If you want to wear your hair in a helmet, fine, you do you. But don’t act like it’s perfectly safe just because you haven’t seen studies that prove its not. If you aren’t using the safety equipment as designed, you assume you are taking on risk. If you want to be safe while having your hair in a helmet, invest in something more substantial than a flimsy hair net to compress your hair down, especially if it’s thick.
And no, saying that putting your hair in a helmet isn’t as safe is not being racist (which was the original comment made that sparked a lot of the debate). If you have extra thick hair, you compress it as much as you can under a helmet to comply with equipment instructions. That goes for all hair types. It’s not rocket science (I should know). If your hair is creating a squishy cushion between your head and your helmet, you are taking a risk that the helmet will not work as intended. Whether you accept the risk or not is on you (general). But pretending the risk is not there is incorrect.
Oh and I saw one comment about studies being done for other sports so it doesn’t apply to equestrians. Which is a bit of a ridiculous argument too, if having your hair in a helmet while skiing is unsafe, you can sure as hell bet it’s unsafe for riding.