LIGHT SPEED. Our lightest racing shoe, the Nike Streakfly is all about the speed you need to take on the competition in a mile, 5K or 10K race. Low profile with sleek details, it feels like it disappears on your foot to help you better connect with the road on the way to your personal best. Low and Nimble A full-length ZoomX midsole provides optimal lightweight responsiveness. The foam stack heights are lower than the Vaporfly, saving weight and giving you a more aggressive feel.