Nike Advises Federations to Steam World Cup Jerseys to Fix Shoulder Seam Issue

The Shoulder Seam Issue

Nike's World Cup kits, which debuted in March 2026, featured an unsightly bulge along the shoulder seam, noticeable on players like France's Kylian Mbappé. The issue was acknowledged by Nike, which stated that "the overall aesthetic is not where it needs to be."

Nike's Solution: Steam the Jerseys

Instead of altering the shirts, Nike provided instructions to member federations on how to care for the jerseys: wash them before wearing and steam the shoulder seams. This solution appears to have partially addressed the issue, as the problem was less noticeable during May and June friendlies.

The Design Process

Nike boasted about the advanced design process used to create the shirts, including "computational design" and a "highly specialized, stitch-specific knitting process" to help athletes stay cool. The process was driven by performance data and incorporated elements of AI.

The Impact on Fans

While the issue has been partially resolved for players, fans in the stands may still be affected until they purchase a steamer. The kits have been popular among fans, particularly those of the United States, who will wear a red-and-white, flag-themed top against Paraguay.

The Future Outlook

This rare miss for Nike highlights the challenges of balancing design innovation with practical considerations. As the World Cup begins, it remains to be seen how the jerseys will perform and whether Nike will need to revisit their design process in the future.