Design: Nike Flyweave construction on the upper provides a secure and conforming fit for various foot shapes In-Shoe Comfort: The forefoot Air Zoom unit has two chambers to give you propulsion and stability from takeoff to the tape Durability & Traction: Carbon fiber Flyplate's shape and stiffness give you a propulsive feel Removed the middle spike from the original Maxfly and elevated the platform on the big-toe side Additional Details: Designed for 100m - 400m events