Head(?)gear, son.

[Hisou Rokuna]

Rebreather
Rank: C
Type: Neck
Description: A breathing apparatus that stores oxygen in two cylinders located on either side of the device. It holds three posts worth of air, allowing a ninja to fight at extremely high altitudes or underwater without adverse effects. It can also be used to avoid breathing in non-corrosive poison, although it will be rendered useless once the oxygen stored in it is expended. The oxygen can only be refilled outside of combat.
Cost: 1,000 Ryo

Respirator
Rank: C
Type: Neck
Description: A breathing apparatus that is strapped across the mouth. It filters air, protecting against airborne viruses, non-corrosive poisons, and environmental hazards such as deadly spores. It has no effect on lowered oxygen levels or areas in which there is no available oxygen, such as underwater. There is no limit on how much air it can filter.
Cost: 1,000 Ryo

Gas Mask
Rank: B
Type: Head
Description: A breathing apparatus in the shape of a mask. It preforms the same function as the Respirator, but it also provides protection against attacks equivalent to C rank armor. It also protects the eyes from various hazards, such as attacks specifically targeting them or dust. There is no limit on how much air it can filter.
Cost: 5,000 Ryo

Note: I thought they would be better as items, but Addy said they should be protectorates. So if it's wrong, everyone blame her.

[Comatose]

Rebreather and Respirator really should be higher ranked, at least B. Their prices should change accordingly.

Also, respirator itself is iffy. There is the possibility for techniques revolving around spores and the like. It'd essentially negate that whole deal. Perhaps a tiered respirator is in order, each version blocking a different rank of jutsu? Otherwise it's quite unfair of an item. Gas Mask is similar in this respect.

[marvolous.]

You have three days to update this or it'll be archived.

[Comatose]

Archived.