Survival Mantle

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).