Ok thank you everyone! :)
I know for sure the rubber reins are not allowed in the hunters and I’m pretty sure rubber coated laced reins are not allowed either. But I would check the US Equestrian rules to be sure.
I don’t think you can, but it might depend on the show and circuit. I would check the USEF handbook to be sure.
They make hunter rubber reins where they’re leather on the outside and rubber on the inside
I believe you can but I wouldn’t count on it. Since it is judged on your horse I don’t think that it would be a problem. I would check with your trainer, and if you get docked points that you may have an idea why! Best of luck!