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.