New Balance Sues Decathlon Over Running Shoe Logo That Looks Too Much Like Its Iconic "N": What This Means for Brand Protection

New Balance Athletics filed a trademark infringement lawsuit on September 15, 2026, against Decathlon America in the U.S. District Court for the District of Massachusetts. New Balance alleges that the logo appearing on Decathlon's Kiprun line of running shoes is "virtually identical" to its iconic "N" trademark, which the company has used on footwear since the 1970s. The case raises important questions about how consumers perceive logos and what happens when a letter-based mark on a competing product creates confusion in the marketplace.

The Dispute

At the center of the lawsuit is the stylized mark that Decathlon places on the side of its Kiprun running shoes. Decathlon maintains that the design represents a stylized "K" for Kiprun. New Balance disagrees. According to the complaint, when Decathlon mirrors the symbol on the opposite side of the shoe, the result is "unmistakably an N." New Balance says it first raised its concerns with Decathlon in January 2026 and asked the company to change the design. Decathlon declined, and New Balance filed suit.

The complaint identifies multiple Kiprun shoe models bearing the challenged logo, including the Kipstorm Elite, Kipstorm Tempo, Kipride, Kipride Max, Kipsummit, and Kipsummit Race. New Balance claims its "N" mark is one of the most recognized logos in the athletic footwear industry, backed by hundreds of millions of dollars in promotional spending over several decades. Perhaps most notably, New Balance included examples of social media posts from consumers who saw the Kiprun shoes and believed the logo was the New Balance "N," not a "K." These posts could serve as direct evidence of actual consumer confusion, which is one of the strongest forms of evidence in any trademark infringement case.

How Trademark Infringement Works

The central question in a trademark infringement case is not whether two marks are technically identical. It is whether the use of a similar mark is likely to cause confusion among consumers about the source of the product. Courts evaluate several factors when making this determination, including the strength of the original mark, the similarity of the marks in appearance and sound, the similarity of the products, and the sophistication of the consumers. A brand does not need to prove that every consumer was confused. It needs to show that confusion is probable given how the marks are used in the marketplace.

This case also illustrates why the placement of a mark matters. New Balance has placed its "N" on the side of athletic shoes for decades. When a competing shoe features a similar-looking letter in the same position, the visual association becomes much stronger. Even if Decathlon intended the mark to be a "K," the legal analysis focuses on how consumers actually perceive the mark, not what the designer intended.

Key Takeaway for Business Owners

If your business relies on a distinctive logo or brand mark, this case is a reminder that trademark protection starts with being proactive. Register your marks with the USPTO to establish the strongest possible legal foundation, and monitor the marketplace for similar marks that could create consumer confusion. If you identify a potential infringement, address it early through a cease-and-desist letter before the problem escalates.

Equally important, if you are developing a new brand or logo, conduct a thorough trademark search before investing in your design. The cost of changing a logo after launch, especially after a federal lawsuit, is far greater than the cost of ensuring your branding is clear of conflicts from the start. Schedule a free consultation with Diorio IP Law Group to discuss how to protect your brand and avoid trademark disputes.