Engineered for ultimate versatility, the On Running Cloud X 4 AD trainers are dynamic and durable, perfect for everything from daily commutes to intense HIIT sessions. The newly engineered mesh upper provides a seamless, lightweight, and breathable feel for optimal performance. Featuring an updated heel fit and a unique fork-shaped Speedboard®, these trainers enhance flexibility for exceptional comfort with every step. The CloudTec Phase® soles and Speedboard® technology work in harmony to support your every stride, ensuring a comfortable and stable experience whether you're running or resting. Designed with a light, cool, and breathable mesh upper, these trainers offer superior comfort and support with CloudTec cushioning. Raised collar edges and a wide base provide top-tier stability.