The Nike InfinityRN 4 is designed for men, delivering maximum comfort and support for daily runs. Engineered with innovative technologies and eco-friendly materials, this model offers a soft and stable running experience. The new React X midsole provides 13% more energy return, helping you run longer and faster with less effort. The midsole features a rocker geometry for a smooth transition from heel to toe, making each step more efficient. The updated Flyknit upper provides a snug, comfortable fit that adapts to your foot's natural movements. This running shoe has a 9mm heel drop.