Design: Atomknit, an updated version of Flyknit, has a lightweight, contoured fit and enhanced breathability A new knit structure and midfoot containment cables give you an ultralightweight upper In-Shoe Comfort: The forefoot Air Zoom unit has two chambers to give you propulsion and stability from takeoff to the tape Durability & Traction: Full-length carbon fiber Flyplate is tuned to match the base of the support system The new plate material is lighter and more responsive than the previous version, It also improves the durability of the outer traction plate Two spikes were removed from the original in favor of a four-spike design Supportive base creates a wider flat area on bottom of the plate compared to the original Victory Elevated the big-toe side platform to help the spikes feel more stable on the straightaways and especially around the turns Additional Details: Designed for mid-distance events