Why does Wolverine wear a mask (in the comic/animated versions)

So the most common reason a comic character wears a mask is to hide his identity. Additionaly, the mask could also serve a secondary pupose. Batman's has scanners and stuff. The movie version of Captain America wears a mask that possibly doubles as a helmet.

Now everyone on the X-Men team knows that Wolverine is Logan. Most of Magneto's guys do too. The mask appears to be made out of fabric, which can't offer much protection. Not that Wolverine needs it.

I also don't recall any other major X-Men wearing masks. Moreover, the movie version of Wolverine doesn't wear a mask.

I know that Wolverine appears in other comics besides X-men, and maybe he needs to hide his identity there.

Is there a definitive canonical explanation for this mask?