This is the popular Nike ReactX Infinity Run 4 (retail price: 18,700 yen). The color is the popular black, and the size is 24cm. Below is the product description. Exceptional cushioning provides a step up in comfort for your everyday runs. Experience a soft, rocking chair-like platform with the new ReactX foam underfoot. The exceptionally comfortable collar and tongue provide a superior fit. Furthermore, this version features a water-resistant membrane to keep your feet dry. Brand new, purchased from a Nike store. I have other items for sale! Please check them out. Product number: DR2670