What is the name of the familiar spiked helmet, made out of leather, worn by German military forces in the 19th and early 20th centuries?

What is the name of the familiar spiked helmet, made out of leather, worn by German military forces in the 19th and early 20th centuries?

Sallet
Pickelhaube
Armet
Stahlhelm
Barbut

Answer: The correct answer is Pickelhaube