These are adidas middle-distance spikes. They are recommended for those who mainly run middle-distance events from 800m to 10000m. adidas's unique Boost material is used throughout, providing both cushioning and excellent responsiveness. This model is currently discontinued and is a used item, so it is being sold for 8500 yen, down from the original price of 22000 yen. Regarding the size, recent adidas products tend to run large, but with these spikes, the size should be the same as the spikes and shoes you usually wear. Because they have a wider fit, they are easy to wear for those with wider feet, bunions, tailor's bunions, or flat feet. I purchased them about 2-3 years ago, but I am selling them because they didn't fit my feet after wearing them once. I only wore them once for practice, so they are almost like new, but there is some minor wear and tear, so please refrain from purchasing if you are sensitive to this. Thank you for viewing.