Barbut

Barbut is a recurring helmet in the series, usually being a low-ranked helmet that provides no special abilities and only mediocre defenses.

Final Fantasy IX
The Barbut can only be used by Steiner and Freya, and costs 600 Gil to buy. It provides 9 Defense and +2 Spirit, as well as teaching the abilities Alert and Dragon Killer.

Final Fantasy XII
Barbut is a low-ranked helmet that requires 30 LP and the Heavy Armor 3 license to use. It can be bought for 1900 Gil in Rabanastre, and provides 11 Magic Resistance and 4 Strength.

Final Fantasy Tactics
Barbut is a low-ranked helmet that provides +40 HP and can be bought for 1500 Gil.

Final Fantasy Tactics A2: Grimoire of the Rift
Barbut is yet again a low-ranked helmet that provides 7 Defense and 3 Resistance.

Dissidia Final Fantasy
Barbut is a level 15 helmet that provides +1 Defense and +57 Bravery.