Hau

The Hau are a type of Kanohi mask. They are mostly worn by Matoran, but Toa can wear them as well. They give the user the ability to protect itself from any seen attack, but is useless against ambush or an unexpected attack. Lhikan, Tahu, Jaller, and even Makuta in his Matoran form wore the Hau. It is also noted that Mata Nui's symbol is the Kanohi Hau.