Exquisite Sunderseer Mantle

Heirloom Item
Heirloom items scales to the level of the character it is being worn on. It should last most classes to level 80 and can be mailed to a person's alternate character if they are on the same account.

Source
This item is sold by the following vendors for :
 * in Wintergrasp
 * in Wintergrasp

The can also be used for the 10% experience bonus and more useful statistics.