Design: AtomKnit Flyknit fabric is stretched, steamed and set, It delivers a lightweight, contoured fit with minimal water absorption and enhanced breathability Shoelaces are notched so that they stay in place In-Shoe Comfort: Nike ZoomX foam in the heel is incredibly responsive and lightweight, giving you optimal energy return and cushioning for your miles A Zoom Air unit, delivering efficient energy return with every step Traction & Durability: Carbon fiber plate provides a snappy sensation with each step Traction is placed in all areas of contact for grip from toe-off to finish Data from hundreds of runners helped inform the outsole Additional Details: Designed for 800 to 5000 meter events