On Cloud, On Women's Cloud 5 Sneakers, Heather/ Fossil, Blue/Gray, Size 10 GENTLY used, minimally. Quick lacing system Syntetika: The synthetic upper is made of synthetic materials that are lightweight, durable and easy to clean. It provides good protection against moisture and at the same time allows for a comfortable wearing experience. Midsole CloudTec®: Technology developed by Swiss company On that is designed to improve the performance of running shoes. It incorporates unique hollow cylindrical elements in the outsole, known as Clouds, that compress vertically and horizontally to provide a soft landing and strong take-off. Speedboard®: Speedboard™ technology is designed to harness the kinetic energy produced during movement and convert it into momentum. This means that the more you move, the more the technology accelerates and propels you forward Sole Rubber: The rubber outsole provides excellent grip and durability on a variety of surfaces.