Bondage hood
From wipipedia.org

A bondage hood is a hood whose primary purpose is to allow the head of the victim to be secured as part of a BDSM scene involving bondage. Bondage hoods are made from heavy grade leather and will have D-rings in various locations to allow rope or chains to be attached to the hood.
Bondage hoods will often incorporate elements of other hood designs such as gimp masks and isolation hoods.