Demetrious Johnson Xbox and Microsoft backed UFC flyweight champion Demetrious Johnson  has one of the most well-known fighter-sponsor partnerships in the sport. Johnson’s attire through fight week and on fight night has remained the same for years, but with the introduction of Reebok-sponsored UFC uniforms in 2015 , everything is about to change. While the reigning UFC titleholder admits details of the recently announced Reebok deal are still scarce, he does know it’s going to completely change the dynamic of his relationship with existing sponsors.