Avnilian helmets were helmets worn by the Avnilians.
Its design completely encompassed the head in an almost oval-like shape. They contained two, round, eye holes and one side-ways hole that was located between the wearer's nose and mouth.[1]
History[]

In 1997, when Lt. Thomas Frakes and Lt. Laurence Conner attempted to escape to Avnil's Stargate to warn the SGC about what was going on with Captain Jonas Hanson and the natives, the two members of SG-9 were pursued by Avnilians in helmets and headdresses, armed with spears, blowguns and torches.
When SG-1 and Conner had camped on the planet, natives in headdresses and helmets attacked the group and took Conner.
Later, when Captain Sam Carter was brought to the caves, there was a native in a helmet, holding a spear. (SG1: "The First Commandment")