The extreme-sledding craze known as airboarding got its start in Europe, but it's crossed the pond in the past few years. I believe Keystone, Aspen, and Winter Park are the only Colorado resorts that are allowing or offering it in any form as of 2009-10.
It's basically sledding down the mountain face-first on an inflatable bodyboard. The speeds these guys hit are simply insane -- the record is nearly 90 mile per hour. Above is a video of the record-holder Laurent Matthey setting the mark in Switzerland a couple years back. After the jump -- in no particular order -- are four more entertaining videos...
an airboard acrobat in all his glory:
An ad from the makers of the Airboard:
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