Skid boots are designed to protect the back of a horse's fetlocks during hard stops. They are worn on the hind legs only and may be made from either leather or neoprene. This pair, made by Professional's Choice, is typical of the leather variety. Although no discipline mandates the use of skid boots, you would be hard pressed to find a reining horse or roping horse competing without them. They are also used on some barrel racers.