Survival Mantle
Medium armor
- Armor Class: 15 + Dex modifier (max of +2)
- Stealth: The wearer has disadvantage on Stealth (DEX) checks.
- Weight: 40.0 lbs.
This carapace-like augmentation encases portions of the wearer’s shoulders, neck, and chest. A survival mantle is equivalent to a suit of nonmagical half plate armor and takes just as long to don or doff. It can’t be worn with other kinds of armor.
A creature wearing a survival mantle can breathe normally in any environment (including a vacuum) and has advantage on saving throws against harmful gases (such as those created by a cloudkill spell, a stinking cloud spell, inhaled poisons, and the breath weapons of some dragons).
Source: Volo’s Guide to Monsters p. 81