Nike Every time Ja steps on the court, it's showtime. To help him elevate his game, we worked with him to make the bounciest Ja signature shoe so far. The Ja 3 is light, tough and a game-changer with full-length Hybrid ZoomX foam. “ZoomX is crazy responsive,” Ja says. “I call it that jet fuel.” We call it bad news for his defenders. Specs Full-length Hybrid ZoomX foam gives Ja Nike's highest energy return. "It's that extra boost when I'm already moving fast," Ja says.