This item is crafted by leatherworkers with a skill level of 450. The recipe can be learned from Grandmaster Leatherworkers such as Diane Cannings <Grand Master Leatherworking Trainer> in Dalaran.
This buff does not stack with the druid buffs [Mark of the Wild] or [Gift of the Wild]. It was added so that guilds that primarily run 10-man instances without druids could still have a similar buff.
Patch changes
Patch 3.3.0 (08-Dec-2009): The buff from this item will no longer be cancelled when the player who used the item swaps talent specializations.