British pop star Jessie J worked with Nike Master Trainers to develop her own workout regimen earlier this year, and her follow-up project with the Swoosh centers around two styles of the Air Max 90. One features traditional tooling while the other rests on a Lunarlon sole unit, finished with a virtually seamless upper constructed with mesh paneling for lightweight breathability. Both pairs are done up in a black/red color scheme topped off with a custom tongue tag and purple rubber outsoles for an added pop of color. The kicks are part of a Jessie J Nike Air Max Day Challenge, in which participants embark on a scavenger hunt throughout London.