Premium aerodynamic load bars for an exceptionally quiet ride and easy installation of accessories. 2-pack. FEATURES: a Load bar for Thule Evo roof rack system a WindDiffuser technology disturbs airflow to reduce noise and drag for improved fuel economy a TrailEdge design reduces aerodynamic drag by allowing clean air separation from bar a SmartSlides slidable length scale doubles as an under-bar aerodynamic cover, providing quick, no-hassle rack installation a SwingBlade end cap pivots open to allow full access to the T-slot for easy accessory installs a Upper T-track with QuickAccess interface allows smooth installation and removal of accessories a BoxBeam internal structure creates an exceptionally strong load bar a Check the Thule Buyer&';s Guide to find out which roof rack fits your car