On Cloudboom Echo Used only indoors for 2km. 27cm On's fastest marathon shoe, featuring a carbon fiber SpeedboardR for powerful propulsion. ◇ The ultra-lightweight Cloudboom Echo features a carbon Speedboard+AX29 with a significantly upturned toe, delivering even more powerful propulsion than before. The upper incorporates a minimalist design and enhanced cushioning in the forefoot. ■ Color (manufacturer's designation): White x Emerald Green (White Mint) ■ Upper material: Mesh ■ Sole material: Helion ■ Completion time: Around 3 hours for a full marathon Type: Running shoes Gender: Men Popular model/series: Cloudspike 1500m Popular model/series: Cloudspike 10000m