The Zoom Rival Fly from the "EKIDEN PACK" is inspired by the Japanese mountain scenery that runners race through, with the theme of the runners running in the 2020 "96th Hakone Ekiden." Production/sales have now ended. I am selling these because they are the wrong size for me. They have been used, but they are lightweight and in good condition. If you are interested, please consider purchasing them. A "Zoom Air" unit is built into the forefoot, generating excellent propulsive force. Flex grooves on the sole support optimal toe-off, and the soft foam provides comfortable cushioning.