Adamantium is the fictional metal bonded to Wolverine’s skeleton and claws in Marvel Comics.
The character Wolverine is associated with an experimental procedure that coats or replaces much of his skeleton with adamantium, an exceptionally strong alloy. The process makes his bones and claws extremely durable, but it is also presented as traumatic and dangerous rather than as a simple upgrade.
Wolverine’s claws were originally depicted as part of his natural mutation in his first appearances. Later stories established that the adamantium bonding process covers the claws as well, making them capable of cutting through many materials. His mutant healing factor helps him survive the procedure and recover from injuries.
Adamantium is often confused with vibranium, another Marvel metal. Vibranium is especially associated with Black Panther and Captain America’s shield, while adamantium is most strongly associated with Wolverine. Marvel stories have introduced different grades and versions, so the material’s exact properties can vary between continuities.