Nike Pico 4 - Boys' Toddler The Nike Pico 4 has adjustable straps and a built-in kick-off groove for a comfortable fit that's easy to put on and take off. Leather upper for durability and a comfortable fit. Hook-and-loop closure straps for easy on and off. Outsole wraps at the toe for enhanced durability. Deep flex grooves at the forefoot for flexibility and natural range of motion. Built-in kick-off groove at the heel for easy removal. Overlays at the forefoot for a secure fit. Flexible cupsole for lightweight cushioning.