During a avalanche, snow crystals come down at a great velocity. To survive during an avalanche, it is important not to fall into the snow, and a ski airbag helps push the body upwards. This is due to a principle that causes objects larger than the snow crystals to be pushed upwards. An airbag helps to lift your weight and prevent you from falling. If you get caught in the snow, the inflated airbag will give you more space to breathe, significantly increasing your survival chances.