Thule WingBar Evo roof bars are one component of a Thule WingBar Evo roof rack system. The WingBar Evo roof bars feature Thule's TrailEdge design which reduces drag by allowing for clean air separation between the bar and the air flowing over it. To further cut down on potential wind noise Thule uses their patented WindDiffuser technology which disturbs the airflow over the bar limiting noise and improving fuel economy in comparison to other crossbar styles. Available in four different sizes: 108cm(43"), 118cm(47"), 135cm(53"), and 150cm(60") as well as two colours: silver and black; the WingBar Evo roof bars are compatible with a wide variety of Thule Foot Packs which are used to create a strong, secure, and aerodynamic roof rack system.