These are practically new Nike React Infinity Flynit 2 shoes. I bought them, did a couple runs (about 10ish miles maybe), and felt like they were too small. Unfortunately I missed the return window. My loss is your gain.
From Nike.com: The Nike React Infinity Run Flyknit 2 continues to help keep you running. A refreshed Flyknit upper uses Flywire technology for support and breathability where you need it. Higher foam provides soft responsiveness and long-lasting comfort, plus a wider forefoot helps lessen the chance of stress-related injuries. It's still one of our most tested shoes, designed to help you feel the potential when your foot hits the pavement.