To return to the matter of stopping: The Stealth-X designers envision riders controlling their speed by carving like a downhill skier and stopping by kicking the sled sideways in a skilike spray of snow.

WSJ: Snolo Stealth-X Review: A Pricey Way to Zip Down Your Private Mountain | Rumble Seat by Dan Neil

Bode Miller, the U.S. Skier who just won a bronze medal in the downhill, is the classic example.

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Born in Chile, but a longtime Spain representative at international level, the 31-year-old became the first skier from her country to win a women's World Cup downhill.

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