On Running Cloud X 4 is a versatile hybrid training shoe that pairs CloudTec® cushioning with a Speedboard® for stability and responsive propulsion, suited to HIIT, gym workouts and short runs. Key attributes: Black | Eclipse | Textile | CloudTec® cushioning for soft landings | Helion™ superfoam midsole for responsive energy return | Speedboard® for added stability and propulsion | Breathable, lightweight construction | Classic lacing for a secure fit | Stiffened heel counter with soft filling | Integrated Speedboard® in the midsole | Low-cut silhouette | Lightweight mesh upper | Outsole with individual CloudTec® elements | Composition & care: Upper: Textile | Lining: Textile | Midsole: Helion™ superfoam | Outsole: Synthetic (CloudTec® rubber elements) | Speedboard: Plastic