Design: The ZoomX Streakfly is Nike's lightest racing shoe ready to help you compete in any mile, 5k or 10k race Ultra-thin knit upper is lightweight yet still provides the support you need for racing Lacing system is laterally offset with a notched tongue to help relieve pressure on the top of the foot Extra reinforcement in the forefoot and partially integrated tongue helps keep a secure feel Low profile with sleek details In-Shoe Comfort: Full-length ZoomX midsole provides the ultimate lightweight responsiveness Foam stack heights are lower than the Vaporfly saving weight Durability and Traction: Outsole was created from runner-based data The traction pattern connects to the pavement based on how your foot hits the ground resulting in a solid grip from foot contact to toe-off