Premium, aerodynamic load bars provide an exceptionally quiet ride and superior carrying performance.WindDiffuser technology disturbs airflow to reduce noise and drag for improved fuel economyExclusive BoxBeam construction with 4 support walls creates one of the strongest, most rigid bars availableThe SwingBlade end cap pivots open to allow full access to the t-slot for easy accessory installsSmartSlide integrated measurement system offers a quick, tape measure-free installation and covers the under bar slots to improve aerodynamics while reducing noise.Sold 2 bars per packRequires Thule Rapid Foot Pack and some systems require vehicle-specific Fit KitThe following products are not compatible with the AeroBlade: 503 Load Stops, 516 Prologue, 579XT Canoe Carrier, 558P Tandem Carrier, 597XT Hullavator, 847 Outrigger II, 870XT-873XT Fairings, 884 Roll Model