Thule wing bars are the latest must have for functionality and design, WindDiffuser technology disturbs airflow to reduce noise and drag for improved fuel economy,TrailEdge design reduces aerodynamic drag by allowing clean air separation from bar, Under-bar SmartSlides double as an aerodynamic cover and an integrated measurement system, providing quick, no-hassle rack installation, SwingBlade end cap pivots open to allow full access to the T-slot for easy accessory installs