Nike React Infinity Flyknit shoes. Like new, worn once! The website says to size up, but they are true to size and ended up too big for me. Womens 11 Euro 43 Still 1 of our most tested shoes, the Nike React Infinity 3 has soft and supportive cushioning. Its soft, stable feel with a smooth ride will carry you through routes, long and short. A breathable upper is made to feel contained, yet flexible. We even added more cushioning around the heel and ankle for a supportive sensation. Keep running, we've got you.