Christian McCaffrey, a running back for the San Francisco 49ers, has left his longtime sponsor to join While on Earth, a performance apparel and footwear brand, as cofounder and investor. McCaffrey had been associated with Nike since his high school days and officially joined its athlete roster in 2017.

San Francisco 49ers running back Christian McCaffrey has taken an equity stake and become co-founder of While on Earth, a performance apparel and footwear startup. This new venture with While on Earth also means McCaffrey has ended his contract with Nike, with whom he had served as an ambassador since 2017.

Christian McCaffrey is already one of the NFL's best running backs when he is on the field, and the San Francisco 49ers star has a new venture off it.