Armor combat suits.
The "Negotiation" was a competition that was held annually on Zaria V between the Zarian master class and the servant class. Competitors wore armored suits equipped with shields and weaponry to use in the fight. The dominant class of the planet was decided by the contract awarded to the representative who won the competition, although the more placid servant class had traditionally always lost.
In the year 2370, Kira Nerys visited the planet and saw the unfair conditions of the servant class. Kira attempted to train the representative of the servant class who would take part in the "Negotiation", although when he proved to be unready to win the competition, Kira took his place and won the event, allowing the servant class to improve their status in Zarian society. (DS9 comic: "Working Vacation")