Canada Goose has filed a lawsuit in federal court in Chicago, charging “an interrelated group of counterfeiters” based in China of selling fake Canada Goose across hundreds of unauthorized websites.

The lawsuit, according to The Chicago Tribune, claims that while it’s “virtually impossible” for Canada Goose to learn the true identities of the defendants, the suit features a URL search tool on its website to verify authorized online retailers. Misspellings, poor grammar and the use of feather mulch instead of goose down, as well as dog hair instead of coyote fur, are signs of counterfeits.