NEVER WORN! Multi-colored (blue) running shoes - Rebel by name, rebel by nature, the FuelCell Rebel v4 will change the way you look at an everyday trainer. The propulsive feel of FuelCell technology creates a remarkably responsive underfoot that can quickly adapt from long, steady runs to something shorter and more spontaneous. Additional details like a streamlined mesh upper add race-inspired accents to a dynamic upbeat trainer, designed to bring an element of fun back into your run.