The breathable mesh ensures optimum wearing comfort.Textile lining for perfect fit.Foam midsole with cushioning for a soft running feeling.The removable insole is additionally damping.A robust solid rubber sole for long life and best traction on different surfaces.Deep incisions in the outer sole allow the feet to bend and move as if barefoot.Nike Free RN - real lightweights, and very comfortable! speed. Deep cuts in the outsole mean your feet flex and move as if you were barefoot.