Sole Material Rubber Outer Material Synthetic Closure Type Lace-up ABOUT THIS ITEM A lightweight Flyknit upper gives you plenty of stretch and airflow while you run. It conforms to your foot for support with every step. Nike react technology creates an extremely smooth ride Molded heel gives a secure, stable feel Contoured collar sits right below your ankle for a stable fit Outsole pattern has rubber on the forefoot and heel for durable traction just where you need it