Gladiator's Kodohide Spaulders

Gladiator's Kodohide Spaulders are leather shoulders only usable by druids. They are one part of the Gladiator's Refuge armor set, the Arena Season 1 set for druids.

Source
As of Arena Season 3, which began on November 27 on US realms and on the 28th on EU realms, this item can be obtained through the Honor System. Prior to the start of this season, it could only be purchased through the Arena PvP System in exchange for Arena Points.

This item can currently be purchased for from the Champion's Hall in Stormwind or the Hall of Legends in Orgrimmar.