Vacuum suit

Vacuum Suits are used by both the UNSC and the Covenant for Extra-vehicular Activity in outer space. Vacuum suits are completely sealed, and come with an extra supply of Oxygen (or whatever other gas the user breathes).

The UNSC utilizes three types of vacuum suits: the ODST Body Suit (15 minutes of breathable atmosphere), the SPI armor system utilized by the Spartan-IIIs (7 minutes of breathable atmosphere), and the MJOLNIR armor system utilized by the Spartan-IIs (90 minutes of breathable atmosphere).

The Covenant also use vacuum suits, such as the blue-and-black suits worn by Jackal Rangers and the vacuum-enhanced armor of Elite Rangers.