Philadelphia Phillies first baseman Bryce Harper will wear other team colors on his footwear. Brad Penner-Imagn Images

Bryce Harper's Under Armour Cleats Celebrate Baseball Rivalries

Originally posted on Sneakers on SI | By Caleb Mezzy | Last updated Aug 26, 2025 12:25 PM ET

One of the most decorated MLB players, Philadelphia Phillies first baseman Bryce Harper, has introduced the Under Armour Harper 10 in a big way. Known for challenging the status quo on his feet, but also with his gear, Harper has a Hall of Fame resume in cleats.

With Under Armour leading the way, Harper has rocked stylish cleats for a decade. Under Armour was aggressively building its baseball footprint with Harper at the forefront, when he was seen as the face of the next generation of the sport.

Harper became one of the few MLB players to receive a signature cleat line, beginning with the Harper One in 2016. The series has continued annually, reaching the Harper 10s in 2025, making him one of the longest-running baseball players with a signature shoe line.

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Harper's admiration for the Phillies' mascot, Phillie Phanatic, has inspired him to show his largest green pal that he can rep him on the field.

Harper has been known to integrate brands like Supreme, honor players like Jose Fernandez or Jackie Robinson, hop in a Miami Vice mode, and represent the Nation's Capital in the Home Run Derby.

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The creativity behind Harper and Under Armour started back in 2011 when he signed as an 18-year-old. The brand, stationed in Baltimore, Maryland, was in the backyard of Harper's while he debuted with the Washington Nationals. Fifteen years later, and they are breaking the mold with Harper's Rivalry Pack.

The Rivalry Series features 'The Three Line,' 'Chop ATL,' 'Miami Bryce,' and 'Capital Star'. Aptly designed for his division rivals respectfully, the New York Mets, Atlanta Braves, Miami Marlins, and his former team, the Washington Nationals.

On Monday night, he lit the rivalry on fire and ignited Mets fans with his color way. This could be part of the last month of baseball as the Phillies take on the Braves this weekend and Miami the following weekend.

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Athletes and fans can shop Harper's signature collection at UA.com. In the meantime, they can expect more heat from the MLB All-Star ramp-up for the postseason.