What was filed
The complaint was filed on September 15, 2026, in the U.S. District Court for the District of Massachusetts. The case is New Balance Athletics, Inc. v. Decathlon America LLC and Decathlon USA LLC, No. 1:26-cv-14235. The complaint says the defendants operate the decathlon.com and kiprun.com online stores. New Balance demands a jury.
What the complaint alleges
The complaint alleges that KIPRUN running shoes carry a K-like design whose mirror image is an N, that the shoes are often shown with the mirror-image side visible, and that the design infringes and dilutes New Balance's registered and common law N trademarks. It pleads five counts: trademark infringement under 15 U.S.C. § 1114, false designation of origin under 15 U.S.C. § 1125(a), dilution under 15 U.S.C. § 1125(c), dilution under Massachusetts law (Mass. Gen. Laws ch. 110H, § 13), and common law trademark infringement and passing off.
Do not read any of that as a holding. The complaint states New Balance's allegations. No court has found that Decathlon infringed.