<a href="http:&#x2F;&#x2F;www.backcountry.com&#x2F;black-diamond-avalung-ii" rel="nofollow">http:&#x2F;&#x2F;www.backcountry.com&#x2F;black-diamond-avalung-ii</a><p>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.