I mean, if you're taking your camera skiing, there is inherent risk involved.. But keep a lens cap for when not filming, if you're a dedicated filmer, keep your camera bag on you and just keep any necessary protection materials in there or pop your cam in while not filming. Grocery bag over body if its snowing or wet (unless your body is weather sealed) and keep a rag with you just incase. If you're using a handle, test it and make sure its secure in it. Otherwise, absorb impacts with your knees and keep a good grip on the camera.