Wear the Armor of a Master Chief this Halloween! Created for the Spartan project, the Mark IV MJOLNIR armor system provides the wearer with a variety of tools useful for the defense of Earth. The Halo 3 Master Chief Supreme Edition Adult Costume includes an excellent quality dark quilted jumpsuit with EVA molded armor, molded gauntlets, and boot tops. A two-piece deluxe Master Chief helmet is also included. 4-piece set. Wipe clean. Polyester. This is an officially licensed Halo 3 costume.