Aerodynamic profile, easy installation and better strength, the Thule Aero Blade Load Bars are the best way to get your gear on your vehicle. . Thule WindDiffuser is a textured surface on the t-slot cover that disturbs the airflow better than a smooth surface, greatly reducing wing noise. . The Thule AeroBlade design also features sharp corners to promote clean ?Ç£air release?Ç¥, helping to reduce aerodynamic drag. . Thule BoxBeam - The sophisticated BoxBeam aluminum extrusion creates one of the strongest load bars in the market. Using a vertical load test, the AeroBlade can sustain over 800 lb. of force. . The new SmartSlide is a molded measurement system providing a quick, no-hassle, tape measure-free foot installation. . Thule SmartSlide also covers the underbar slot to improve aerodynamics and noise diffusion. . The new SwingBlade end cap pivots open to allow full access to the t-slot for easy accessory. . Please consult the Thule Fit Guide to match the correct Thule parts with your vehicle.. . 91021314078 28431500006 ARB43