The Hati head, along with the Hati cloak and paws, can be received as a drop from taking part in killing the Hati wolf during the 2011, 2012, 2013, 2014, 2015, and 2016 Winter events. You may only have one head at a time. The Hati head can be worn in the helmet slot and does not give any bonuses. Unlike the paws, this item is purely cosmetic. If it is lost or destroyed, it can be reclaimed from Diango in Draynor Village.
It is replaced by Vali if lost during the winter events.