Performance-tested to make sure you're provided with the proper support while you run, the Nike Women's React Infinity Run Flyknit 4 Running Sneakers are designed to offer the cushy, responsive sensation you know and love. An updated Flyknit upper, the addition of a water-resistant membrane, and even more React cushioning than before combine for a balanced blend of running tech for an airy, stable, and supportive ride run after run.