Design: Lightweight mesh upper provides breathability and support made to go the distance In-Shoe Comfort: Nike ZoomX foam is incredibly responsive and lightweight, delivering optimal energy return and impact protection for your miles Durability & Traction: Forefoot plate was created using data from hundreds of runners. It helps ensure a smooth transition from toe-off to heel strike Additional Details: Designed for 1,500m - 10,000m events Detachable stainless steel spikes Weight: 4.4oz (Men's size 8/Women's size 10)