Reebok Unisex Nano X4 Training Pure Grey 3 White Pure Grey 3Reebox Unisex Nano X4 Training Pure Grey 3 White Pure Grey 3 Elevate your training with the Reebox Nano X4 Training Shoes. Ultra lightweight and breathable, the Flexweave woven textile upper and midfoot ventilation panel provide maximum airflow for comfort. Experience enhanced stability and support with the Lift and Run Chassis system, while every stride is cushioned by the Floatride Energy Foam. Train smarter, not harder! FLEXWEAVE woven textile