53 Inch AeroBlade Crossbars, the Aerodynamic shape helps reduce drag and wind noise. SwingBlade™ end caps pivot open to allow full access to the t-slot for easy carrier installs. Rugged, yet lightweight aluminium BoxBeam™ construction. Underneath, SmartSlide™ is a new moulded measurement system that provides a quick, tape-measure-free foot installation. Cross Bars by THULE - Cross Bars, 53 Inch, Not Compatible with Vehicles Equipped with the Vista Roof