It looks like that’s possibly a flame retardant Nomex hood worn by race car drivers, oil field workers and now apparently molotov cocktail pitchers.
The weave looks pretty open for a balaclava, much less a flame retardant hood.
I hadn't heard the molotov chuckers were wearing fire resistant gear, but the ones out on the street the past week have been well supplied with PPE, so it wouldn't surprise me.
Looks like a paint sock that we sell for $2.