 In 2011, the United States Equestrian Federation passed a rule making helmet use mandatory while mounted on competition grounds at U.S. nationally rated eventing competitions.Also in 2011, the United States Dressage Federation made helmet use in competition mandatory for all riders under 18 and all riders who are riding any test at Fourth Level and below.If a rider competing at Prix St. Georges and above is also riding a test at Fourth Level or below, he or she must also wear a helmet at all times while mounted.