protection
to protect their faces
There's the Great helm of Albert von Pranckh, 14th century that shows the helmet style often used by knights of the Teutonic Order. There is a link to an image below. There's also the Codex Manesse depicting Tanhauser in the habit of the Teutonic Order along with a great helm topped with horned wings. They would've worn horned helmets, or several different variations of the great helms with or without horned or any other types of ornamentation throughout the 13th and 14th century. There's also tournament heraldry of knights with horns, animals, fans depicting heraldry and a whole assortment of items on their great helms in order to distinguish themselves from other knights on tournaments and battlefields.
Middle Bottom of the picture. Where the yellow and red tent is with the flag has to helmets with blue plumes. In the platform were the guys are fighting in the floor.
You cannot plume helmets in runescape. But you can use a full helmet with a herald stand in your Player Owned House, and there are treasure trail rewards with different coloured plumes.
Knight's armor was typically made of steel, which has a silver color. However, knights often adorned their armor with decorative elements such as engravings, paintings, or colored plumes, which could make the armor appear in various colors.
When the knights rode their horses and charged at each other they would yell "shut up" and that meant to shut their helmets.
Plumes of molten rock originating deep within the mantle are known as mantle plumes. These plumes are believed to be responsible for hotspots and volcanic activity at the Earth's surface.
Underground
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Borrowed Plumes - 1916 I was released on: USA: 18 February 1916
In Borrowed Plumes - 1926 was released on: USA: 10 February 1926
Knights wore helmets to protect their heads. They also wore a chain mail cap called a mail coif, which protected head and neck.