Featuring "DNA FLASH," a new lightweight and highly responsive material created by adding liquid nitrogen gas to BROOKS DNA. The upper is made of high-elastic nylon, providing a secure hold for the runner's foot. This is a speed model suitable for everything from daily jogging to speed training and races. There is some minor damage on the right side of the right outsole, but the rebound is still good, and it can be used as a daily trainer without any problems. Thank you.