Outrigger skis are skis that are used by para-skiers to assist with balance, turn, control their speed, stop and amplify the direction of turns. They vary in size and height, and include different features. Depending on the total number of skis used by the skier, outrigger configuration is sometimes called "Three Track Skiing" or "Four Track Skiing". When falling, skiers are taught to move their arms to prevent falling on the outrigger and injuring themselves.