The Nike Flyknit Racer Unisex Running Shoe provides an adaptive, lightweight fit with a racing-specific rubber outsole that delivers exceptional traction from your first to final mile. Lightweight Support A single-layer Flyknit upper wraps your foot in a second-skin fit for incredible, lightweight support. Adaptive Fit Dynamic Flywire technology adapts to your foot for a custom-like fit and secure lock-down. Ultimate Traction A Waffle rubber outsole with a diamond pattern designed specifically for racing delivers durable traction.