[Slings and Arrows]

What is that thing, please?

[CrazyIvan]

Face sheild. In case of blow back. (I’m assuming that is what the poster intended)

[Right Wing Assault]

It's a plastic see-through face shield. Similar to what someone would wear while using tools that might shoot out liquids, pieces of wood, metal, etc. Medical people also wear them when there is danger of blood or bodily fluid spray. Here's a better pic.