Apparently these have some cool technology that help runners run faster or longer or something 🤷🏻‍♀️ my husband hated them 😂 they had him running too much and his knee was hurting. They’re lightly used, refer to pics. Have some sorta carbon insert 🤷🏻‍♀️, they’re running shoes, I’m listing what he paid and what I’m asking 😅