What are the masks Slipknot and other bands wear called?

Slipknot masks are custom-made masks designed for stage performances to create unique identities for band members.

Over the past 29 years, the band members created their masks from various unconventional objects; however, the earliest and original Slipknot's mask collection was developed with latex, leather, wire mesh or metal, foam padding from car seats, dental acrylics, dental molds, clay sculpting, resin casting/fiberglass.