Spangenhelms may incorporate mail as neck protection, thus forming a partial aventail.
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A mail collar hanging from a helmet is camail or aventail.
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Mail was commonly used to protect the face, neck and cheek either as an aventail from the helmet or as a mail coif.
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Mail was commonly used to protect the face, neck and cheeks either as an aventail from the helmet or as a mail coif.
From the en.wikipedia.org
The helmet was often complemented by chain mail, either as just an aventail to protect the neck and elbows or as a mask concealing the wearer's face.
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Mail armour was commonly used to protect the face and neck, either as an aventail from the helmet or as a mail coif like was used in Romano-Byzantine armies since 5th century.
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More examples
Camail: a medieval hood of mail suspended from a basinet to protect the head and neck
An aventail or camail is a flexible curtain of mail on a helmet that extends to cover the neck and shoulders. The mail could be attached to the helm by threading a leather cord through brass rings at the edge of the helm. ...
The flap or adjustable part of the hood of mail, which when unfastened allowed the hood to drop upon the shoulders; The movable front to a helmet; the ventail
A skirt of mail attached to a bascinet or armet during the 14th and 15th centuries. It defends the neck from attack, usually hanging to at least 1" below the shoulder point for bascinets. ...
In maille armour, a flap that protects the lower part of the face. The aventail is usually tied to the coif (2) to keep it in place.
A curtain of mail attached by means of staples around the base of a helmet. This protects the neck and the shoulders.
Mail, attached to the bottom edge of a helmet, often by vervelles, covering the neck and shoulders
Mail neck-defence attached to the lower edge of a basinet; smaller versions were attached to armets. In France referred to as a camail.
A curtain of maille suspended from a helmet protecting the neck, throat and sometimes lower jaw.