Nike Ribbie Jr (Bg) 309303-011 Black White Lace-up Baseball Cleats (Kids 4.5, Black). Little cleats for tomorrow's diamond dominators. The Nike Ribbie Jr. (10c6y) Boys' Baseball Cleat is a lightweight, cushioned shoe with breathable synthetic leather and rubber cleats for supreme grip. A midsole EVA wedge delivers lightweight cushioning. A performance rubber outsole utilizes Nike Regrind technology for enhanced sustainability.