The FuelCell foam embedded in these shoes provides a smooth and powerful sensation to propel you forward. The upper is made of synthetic engineered mesh, allowing for breathability and a lightweight experience. The tongue and collar are designed to provide a secure fit, especially around the heel. The Energy Arc feature combines a carbon fiber plate with carefully positioned midsole voids, resulting in increased stored energy and a high level of energy return. These shoes also include a carbon fiber plate for added support and stability.