Everyone has heard the horror story: "I went into the mountain lodge for lunch and when I came out, my skis and snowboard were stolen." It happens all the time; the only way to prevent theft is to ensure you've got the lock cores to prevent thieves from getting at your skis and boards. Both Thule and Yakima make lock cores that will do the trick, turning your roof ski racks and roof ski carriers into locked and protected transporters of your gear.