(4) Set: Increases your movement speed by 15% while in Bear Form, Cat Form, or Travel Form. Only active outdoors. This speed increase is not cumulative with Feline Swiftness.
In The Burning Crusade it is item level 136 and requires level 70. In Wrath of the Lich King it is item level 136, requires level 70 and sells to vendors for 1c. In MoP Classic it is item level 136, requires level 70 and sells to vendors for 1c.
Read from the World of Warcraft client build files.
How Merciless Gladiator's Dragonhide Helm Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Merciless Gladiator's Dragonhide Helm suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Items Numbered Next to Merciless Gladiator's Dragonhide Helm
Blizzard numbers items as they are created, so the named items next to ID 31968 (31963 to 31974) were usually added in the same batch as Merciless Gladiator's Dragonhide Helm: the same quest line, zone, vendor or reward set.