We added extra support along the sides via a band at the midfoot. It works with your laces, helping you adjust how snug and secure your foot feels. There's also a clip at the heel, helping with stability as you run over uneven surfaces. We tested real runners to learn where feet need the most cooling. Using that data, we put mesh in key spots (especially around the toes) to give you stretch and ventilation. Your foot sits on Nike ZoomX, our lightest and highest energy returning foam. It gives you a smooth ride from foot strike through your transition. We combined it with Zoom Air cushioning under the forefoot for a snappy, responsive feel as you push off. High-abrasion rubber at the outsole with lugs gives you durable traction. The tongue is even more plush than previous versions.