It depends upon artistic rendering.
The helmet of invisibility belonging to Hades in Greek mythology is called the Cap of Invisibility. This magical helmet allows the wearer to become invisible when worn. It is one of the three legendary items known as the Helm, Cap, or Helmet of Darkness.
Hades' symbol, the Healm of Darkness also known as the invisible helmet was a helmet made for Hades by the Cyclopes. It is his symbol of power. It can make fear so intense that it can stope your heart.
In Greek mythology, the helmet of Hades, also known as the Cap of Invisibility, grants its wearer the ability to turn invisible. It was instrumental for Hades in moving undetected through the underworld and in battles with other gods and creatures.
Hades wears the Helm of Darkness, also known as the Cap of Invisibility, to make himself unseen or invisible to others. It helps him maintain control over the Underworld and enhance his powers as the god of the dead.
The Helm of Darkness (Hades' helmet) in Greek mythology is described as being made of dark material like shadow or mist. It is said to be able to make the wearer invisible. It doesn't have a specific design since it is a mythical artifact.
THEY LOOK LIKE HADES in hercules
The Invisibility Cap is Hades's special "weapon," just like Zeus's is his thunderbolts and Poseidon's is his trident.
Attached link is to vase art of Hades palace.
turns him invisible
his look doesn't change
One symbol for Hades is Cerberus, the three headed dog that guarded the gates of Hades to prevent the dead, who enter on the river Styx, from leaving. Another object that is associated with Hades is the Cap of Invisibility, also referred to as the Helm of Darkness or the Helm/Cap of Hades. The Cap of Invisibility was given to Hades by the Cyclops. They gave it to him as the gave Zeus his thunderbolts and Poseidon his trident. As the trident is Poseidon's main symbol and thunderbolts are Zeus's, the Cap of Invisibility could be considered Hades's main symbol. The Cap of Invisibility allows the wearer to be invisible to any supernatural beings. The cap has a pair of wings on it, attached to each side of the cap.
hades is the kingdom
Theyre not real
Hades had a "cap of invisibility." The Helm of Hades made the wearer invisible to both gods and mortals.
The bident is supposedly black. The bident was never used by anyone other than Hades
Made of ebony
a regular cap