See also:

Backrest width
Change the width of the backrest using the side wings to adjust the lateral support. ...

BMW X3 iDrive Owners Manual
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2010 BMW X5 M Review
On paper, the BMW X5 M seems about as incongruous as a car can be. It's a five-seat midsize crossover powered by a 555-horsepower, twin-turbocharged V-8 engine that can accelerate from zero to 60 ...