Blue fox fur is a type of fur obtained from the arctic fox (most specifically, its blue variant). The other of the two zoological morphs is called white fox, whose fur (the white fox fur) is also a fur commodity.
The blue fox, an arctic fox variant, is considered more valuable than the matted and smaller fur of the white fox. Almost white blue foxes with only a slightly darker middle of the fur are traded as shadow foxes; pure white fur is usually sold to the end consumer as white fox, like that of the arctic fox.
In the jargon of the fur trade industry, the dark, bluish winter furs of all types are referred to as “blue”, not just those of the “blue” foxes, in contrast to “red”, the lighter and therefore usually less valued color variants of the same fur type.
The fur trade classifies the blue fox fur among the so-called noble fox furs, such as the silver fox fur, the arctic fox fur and the cross fox fur.