chainmail hauberk galvanized butted round ringsHauberks like this were worn by both the 9th century Vikings and the 13th century crusaders. This hauberk is made of unriveted round rings. The rings are made of mild steel and are woven together in a 4: 1 construction. This means that 1 ring is attached to 4 other rings. Chainmail shirts like these were worn from the 11th century onwards. This type of long chainmail shirt, also called a hauberk, features a split. The split provides extra comfort