The Iron Rivet Greaves are a piece of DLC Armor added to Elden Ring by the Shadow of the Erdtree DLC. You can get the Iron Rivet Greaves by defeating Red Bear in the Northern Nameless Mausoleum ...

His analysis showed the builders used stronger steel rivets where they expected the greatest stress and weaker iron rivets for the stern and the bow, where they thought there would be less ...