The Nike Zoom Superfly R4 is ideal for the power sprinter (100m-200m) looking for a technical track spike that provides a dynamic lock down on top with a lightweight, yet aggressive plate. Exposed dynamic Flywire technology provides midfoot clamp shell to pull securely around the foot for a secure and confident lock down. Thin Phylon midsole wedge keeps the shoe light and low to the ground while offering impact cushioning. Aggressive Pebax® plate with eight spike receptacles and adapters for maximum power, speed, and traction on the track. Includes 7mm Xmas Tree spikes and a wrench. Wt. 7.8 oz.