Chrome Ventvisors
4 piece set
Fits:
1999 thru 2011 Ford Superduty F250 F350 F450 F550 4 door Crew Cab
SIDEWIND DEFLECTORS
Beat the elements and add some attitude to your Truck, Van, or SUV. Sidewind Deflectors allow you to keep your windows partially open, to provide ventilation to the interior.
Today's modern aerodynamic body styles' form fitting doors and windows no longer feature "rain gutters" to channel away water. The result is usually water dripping into the interior. Sidewinds act like a "drip-edge" for your vehicle, this allows you to keep your window partially open for ventilation, without the rain getting in.
As air flows around the outside edge of the sidewind it creates a small 
low pressure area underneath it (much like an airplane wing)which creates suction to keep out the wind and draw out the stale air from inside your vehicle.
