Official rules for endurance riding?

Can anyone point me to the official rules for endurance riding?
I got a book about endurance riding when I was a kid and at the time hoof boots could not go above the coronet band. It appears that Renegades are now legal footware which obviously means the rules have changed. I’m wondering what the new rules are.

I’ll probably read the whole rulebook as well. Just because it’s the sort of thing I do. :lol:

aerc.org