This chain maille is made of galvanized, round, butted rings. Galvanizing the rings' surface provides protection from corrosion (rust). We call this type of chain maile Butted Mild Steel Zinc-plated.
A haubergeon is a mid-sleeve chain maille shirt that reaches to the thighs.
Details - chest circumference: approx. 150 cm when fully extended. Your chest should not exceed 135 cm when wearing your gambeson. - length: approx. 90 cm - arm length: approx. 31 cm - ring thickness: 1.6 mm - interior diameter: 8 mm - weight: approx. 14 kg - finish: zinc-plated