Aventail

An aventail is a flexible curtain of chainmail on a helmet, that extends to cover the neck and shoulders. The mail could be removed for cleaning or storage, and attached to the helm through use of a leather cord that was threaded through brass rings at the edge of the helm. Aventails were most commonly seen on bascinets in the 14th century and served as a replacement for a mail coif. Some aventails were decorated with edging in brass or bronze links, or dagged edges.

Aventail is also a SSL VPN computer program created by the Aventail corporation [1].