Frostfire Leggings

Frostfire Leggings are cloth leg armor for mages. It is part of the Frostfire Regalia armor set.

Source
This item was a quest reward from Frostfire Leggings (quest). The required quest item Desecrated Leggings dropped from Loatheb in Naxxramas.

It was removed from the game, but later reintroduced via the Black Market Auction House with a starting bid of.