Endless comfort. Infinite possibilities. Run like you mean to finish on top every single time in the Nike React Infinity Run Flyknit 4. Staying true to classic Nike athletic technology, these runners take care of your hardworking feet with a Flyknit upper that enhances breathability. The Nike React technology delivers the best stride ever, while the curved rocker outsole makes every step feel more natural and rewarding. Fuel your performance with cutting-edge athletic technology in the Nike React Infinity Run Flyknit 4. Nike React Infinity Run Flyknit 4 features: *Size up a half-size when buying these sneakers.