Flexible Nike Free technology puts biomechanic comfort and agility under every step in a training shoe that moves with you through circuits, sprints and squats. It's built from the ground up with a wide heel and solid base to stabilize lifts and strength training, with internal webbing providing a locked-in feel and a dynamic fit that support quick changes of speed and direction. Innovative chain-link mesh in the upper stretches, rebounds and breathes to keep your footing cool as your intensity heats up. Style Name:Nike Free Metcon 4 Training Shoe (Men). Style Number: 6121496_1.