Wearing any four (or more) of a superior tetsu armour set (including augmented parts, but not weapons) grants a passive ability, Iron Fist, which gives a chance to obtain a ports resource crate when defeating an opponent.
Armour gizmos charged with perks can be used to enhance the armour's abilities. As a legs slot item, the Augmented Tetsu legs can hold 2 gizmos, allowing up to 4 perks (2 on each).
Using this armour in combat can gain experience to increase its level. Levelling the armour will have no effect on its ability in combat, but it will improve the experience and materials gained for disassembling it.
The Augmented Tetsu legs uses charges stored in the universal charge pack. When the charge pack runs out of charges, the item loses stats and gizmo effects, and can also no longer gain any equipment experience. Function will resume when the pack is recharged with divine charges.