Burgonet

[1] The burgonet helmet is characterised by a skull with a large fixed or hinged peak projecting above the face-opening, and usually an integral, keel-like, crest or comb running from front to rear.

A flange projects from the lower parts of the skull and cheekpieces to protect the back and sides of the neck.

Though typically a relatively light helmet and open faced, a falling buffe, a sort of visor that was closed by being drawn up rather than down, was sometimes used.

[5] Accompanied by plate armour, burgonets were mostly worn by cavalry, such as demi-lancers and cuirassiers.

The burgonet was common among the mercenary Swiss infantry who were pikemen who could defend themselves against cavalry (perhaps taking helmets of this form as trophies).