Made for race-day speed. The CloudTec(R) cushioning system is engineered for a fast ride and combined with two layers of Helion(TM) HF hyper foam for energy return. The carbon fibre-infused Speedboard(R) drives you forward, and an enhanced rocker and toe-off add extra propulsion. Design: Carbon Speedboard(R) pushes you forward, faster A lightweight, breathable mesh upper endures raceday speeds A secure fit prevents slipping, so you can focus on the race Enhanced rocker and toe-off for extra propulsion In-Shoe Comfort: CloudTec(R) cushioning system engineered for fast runs Double layer of Helion(TM) HF hyper foam for energy return Durability & Traction: A rubber outsole delivers grip and control on curvy courses Additional Details: Best for: Marathon, Competition, Running, Road Running Heel-to-toe drop: 5 mm