[hammock]

Air tube? I ski with beacon, probe & shovel, familiar with airbags but unfamiliar with air tubes.

[roymurdock]

http://www.backcountry.com/black-diamond-avalung-ii

Most ski patrols use ABS to cushion the neck and buoy the skier above the snow, but this is supposed to be OK in a pinch if you can keep it in your mouth while tumbling down a mountain.

[lfowles]

I would assume even if it isn't long enough to break the surface, it will at least get the humid exhaled air away from your face.