Nike Men’s React Infinity Run Flyknit Running Shoes are stronger and more durable. Lightweight and flexible, these shoes feature 3 distinct layers to help keep your foot secure. Lightweight mesh upper Foam midsole Wide heel base for stability Lace closure A stable feel Higher foam stack heights provide a softer feel. A wider shape provides a more stable ride, helping release energy with every step. A smooth ride The shape of the Nike React foam midsole provides support for the 3 phases of a runner’s stride. It helps create flexibility at toe-off, a smooth ride at mid-stance and cushioning at contact.