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What does this button do?

What does this button do?

(Photo: Evan Sears)

Tons of things go into seats, like passengers, child-safety seats and less convenient items like quarters, cellphones and keys that disappear into the black hole between the cushions. Few things, however, come out of a seat unless it's a coil spring poking you in the rear or the extravagant feature Mercedes-Benz incorporates on its E-Class convertible.

The Mercedes-Benz E550 Cabriolet's mysterious button hints that it expels something from the front seats, but it's not the scented breeze of pine trees when your passenger can't catch a hint.

This button activates the Mercedes-Benz Airscarf feature, which was No. 1 on our Top 10 Most Extravagant Car Options list. Part of a $3,270 package, Airscarf (pictured below) places a vent in each of the front seats' head restraints. Those vents blast a warm shot of air directly at the back of your neck on a cool day of drop-top driving. Our home base of Chicago recently experienced a dip in summer temperatures and the Airscarf worked wonders on 60-degree nights.