High Cushion | Stability | 9mm Heel Drop With supportive cushioning built for a smooth run, the Infinity RN 4 helps you hit the ground running. Made with soft, comfortable Nike ReactX foam and updated with Nike Running\'s best-fitting Flyknit yet, this road runner helps you take off anytime, anywhere. It’s the kind of shoe that can grant you that priceless peace of mind to go faster and farther, thanks to high-rise foam stacks and an intuitive design that supports every stride. Snug fit; we recommend ordering a half-size up.  Support for the Planet ReactX foam reduces the carbon footprint of the midsole by at least 43% compared to prior Nike React foam, so it helps support the planet too. Cushioning: Super High The more cushioning that you have underfoot, the softer and more comfortable your running experience can be. Cushioning helps soften impact as your feet hit the ground. ReactX foam gives you an incredibly smooth feeling, helping you push your limits. Support: High The more supportive the shoe, the more stability it can give to your natural stride. A combination of tuned support and intentionally placed cushioning helps you feel secure with every step. A curved outsole helps your foot rock smoothly from heel to toe and through your stride to footstrike. It makes every step feel more natural and adds efficiency to your run, helping you waste less energy as you hit your stride. A new internal Flyknit fit band (like a rubber band around the middle of your foot) offer