I found this weird mask in a grab bag of old parts I got on Amazon, wondering what set it's from. I fits on a Mata head, so I know it's Bionicle.
It's actually not Bionicle. It's from one of those 2002 Hockey sets.
Okay, thank you
Yeah, like they said, it's a.hockey head.
It's one of the seven hockey masks from 2003. It originally came on a sprue with two different masks. It came in either 3543 Slammer Goalie or 3544 Hockey Game Set. The reason it is so short and wide is so that it can fit with a hockey helmet.
I knew about this weird Hockey guys, but never knew their parts were actually compatible with Bionicle parts...
It's Lego. (almost) Everything is compatible.