Little financial information about Ivy Park is available, and it is unclear how successful the brand has been. It was immediately popular upon its release in 2016. On Thursday, its website had been altered to broadcast the Adidas partnership.

The Beyoncé/Adidas collaboration is perhaps the most notable partnership between a superstar and a sports brand yet, and it indicates the consumer and social power that can be derived from such cross-branding. It is also a tribute to the lane Rihanna paved in 2014 when she became a creative director and global ambassador at Puma, back when it was still a novel idea that an entertainer might lend her name to a company best known for athletic apparel. (Rihanna parted ways with Puma and is now said to be working with LVMH on her own luxury brand.)

Championing women and girls has become a key part of Adidas’s public relations strategy. This month, the company announced a new phase of its “She Breaks Barriers” initiative, which highlights the lack of equal media coverage for women’s sports in the United States.

Ms. Knowles has positioned herself as a political voice for black Americans and for women, including through her musical examination of her marriage and her 2018 Coachella performance, which gave a platform to historically black colleges. She will amplify these messages, and those Adidas has already pushed, by giving the company her imprimatur.

“Beyoncé is an iconic creator but also a proven business leader, and together, we have the ability to inspire change and empower the next generation of creators,” said Eric Liedtke, a member of the executive board of Adidas AG.