The Nike React Infinity Run Flyknit 2 ‘Particle Grey’ applies a monochromatic color scheme to a lightweight performance running shoe designed to reduce injury and keep runners on the road. A lightweight Flyknit upper, secured with a combination of traditional laces and Flyknit cables, sits atop a responsive Nike React midsole. The foam compound features a rocker shape that promotes a smooth ride and a fluid transition. Underfoot, durable rubber is placed in high-wear areas for optimal traction.