Nylon headcollars (similar to halters) are used widespread across the world. In my experience at many stables, 98% of the halters that I have seen being used are nylon. So in otherwords, no they do not.
Most of the time it's the horses head.
Although the part of a horses head have special names, the head itself does not - It's just a head. Mfire
A horses head help them to see farther away than what they can see
Fashion. Men wore high collars because it was fashionable, just as women have worn corsets. It has nothing to do with comfort, just fashion.
On their head.
a centaur
a head.
it is when the second horses head is even with the winning horses neck.
normally people in a show make the horses head high but neck arched but horse and cart , horses heads have to be high to pull the cart
You use nylon strings called sidewall and tie knots and loops to string the mesh into the head.
It when the horse eats his head muscle is moving
The knobby area on top of a horses' head and between the ears is called the poll.