There are at least three types
I personally find the full face shields (about $55) to be uncomfortably warm. They are usually worn in addition to a full helmet.
Hybrid face shields (about $65) are also usually worn with a full helmet. Then we have the full cage style helmet (about $50)
Then question with all three types is making sure the thin tip of the long pole cannot get through any of the larger openings. We have not had any clever (or dumb) ideas about how to determine what the student thinks about wearing the helmet or how the student feels about seeing through the cage or face shield.