Use: Teaches you how to summon this mount. This is a very fast mount.
The Reins of the White Polar Bear is an item that can be used to summon a polar bear mount. The reins can very rarely be found inside [Hyldnir Spoils]. The estimated drop rate is currently ~1%.
Although the tooltip of the item states that players as low as level 60 are able to use it, one does actually need to be level 77 as that is the minimum level to do any quest that rewards [Hyldnir Spoils].
Unlike the other currently obtainable bear mounts, the bear's armor is always brown, even for the Alliance.