This is a rather amazing video showing famed snowmobiler Levi LaVallee jumping 361 feet through the air on a snowmobile:
Given that this jump took place in San Diego - a place that never sees snow - how did they do it? Snowmobiles are very happy to ride on grass:
By extension, therefore, they will run on artificial grass. That explains the AstroTurf on the ramps. But there is an area where the ramps appear to be nothing but plywood painted white, with a mat down the middle. The mat provides traction. And the skis would slide across plywood, but steering would be a problem.
If you watch the video carefully, there is a shot from underneath the flying snowmobile. The skis have been modified so they have wheels attached. This would improve the ability of the skis to steer on the plywood, and probably also makes them more slippery, improving speed.
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