I have this fly bonnet
http://marystack.com/schockemoehle-silent-neoprene-lined-fly-bonnet/?gclid=CLmt0eWy9ssCFUmRfgodlsEBpQ
I used it this past weekend in the indoor arena at a recognized show. The Equidome at Westworld of Scottsdale.
When I was done with my ride, the gate person called me over and said she was of the impression that my fly bonnet was not allowed, and she would call the TDs. Not because it is too thick, but, based on it being a fly bonnet used in the indoor arena at all!
We waited for the TDs and they inspected it, and I was told it was perfectly within compliance. But then they said that they needed it removed in order to check both inside the bonnet ears and in the horse’s ears for earplugs. So we did that, and they said thanks, no worries, no earplugs, you’re good.
They did the same at a show in CA last year when my trainer rode in a CDI freestyle, I know because I was her ground helper for that class and I took it off her horse for them. They looked in the bonnet ears and in the horse’s ears, but had no issue. That was also at an indoor (Del Mar Arena).
Anyway I know anecdotes do not equal certified information, but these TDs were all fine with the bonnets being used inside. It isn’t the product material they care about at all, only whether someone is hiding earplugs. Which are definitely against the rules.
And I don’t think “neoprene lined” is an accurate description, because the ears themselves are of a neoprene type material but there is no lining. (Despite the german-based manufacturer’s description of its product as neoprene lined).
Bottom line: they’ve been allowed at the places I’ve been in the past year. Indoors, outdoors, no matter. USEF/CDI, both okay’ed. I’m sticking with it-- my mare listens to me so nicely with it on. We’ve got gnat problems here. And, more importantly it matches my boots.
