Berndt Hummel, owner of the FlipFlop trademark, registered in Germany since 2007, has decided to sue the German distributor of FitFlop shoes, Fitx2, for trademark infringement in a state court in Düsseldorf. The German company, which is also a major licensee of KangaROOS, is considering a possible lawsuit against FitFlop in the U.K., where the alleged infringer is based. While it started up only in 2007, FitFlop has reached sales of 2.5 million pairs in 27 countries so far this year, according to a report in Drapers, with 70 percent of the volume delivered outside the U.K.