Templar Knight Helmet

The image displays a replica medieval great helm.

This type of helmet was widely used by knights and men-at-arms during the 12th to 14th centuries.
It provided excellent all-around protection but had limitations in peripheral vision and ventilation.
The helmet in the image appears to be a reproduction, likely made of steel, intended for purposes such as LARP or reenactments.
It features a flat top, narrow eye slits, and ventilation holes on the lower face.