Nike is facing another legal wrangle over its FlyKnit technology after it emerged the US firm has filed a lawsuit claiming patent infringement by fellow sportswear firm Puma North America Inc. In a complaint with the US District Court in Massachusetts, Nike claims that Puma has “forgone independent innovation and is instead using Nike’s technologies without permission.” Nike also claims it has suffered “irreparable harm and damages” with the company requesting a trial by jury and a permanent injunction instructing Puma from infringing the Nike patents and an award of damages. Puma denies the allegations. The history of FlyKnit technology has been beset with legal issues, mainly involving Nike’s biggest rival Adidas.