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 air release, 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.. Equipped with T track. Feet compatibility: Thule Rapid Traverse 480R Thule Rapid Podium 460R Thule Rapid Crossroad 450R Thule Rapid Gutter 300R Thule Rapid Tracker II 430R.