Kettle hat

It gained its common English language name from its resemblance to a metal cooking pot (the original meaning of kettle).

[2] Early examples were made in the spangenhelm method, of a skull composed of framework filled with separate triangular plates, to which a brim was added.

The kettle hat had an advantage over some other types of helmet, in that it did not interfere with the wearer's vision, hearing or breathing.

These kettle helmets were also used in World War II by the British, Commonwealth forces (such as Australia and Canada).

[4] The British produced a helmet for civilian use in World War II designed to give more protection to the head and neck from above.

Italian kettle hat, last quarter of the 15th century, Cleveland Museum of Art
Netherlands/Burgundian kettle hat with a fluted skull, c. 1475, Metropolitan Museum of Art.
A British Mark II steel Brodie helmet as issued in the Second World War
Burmese Kettle Helmets