This Standard specifies the requirements and test methods for the coverage, sizing, adaptability and adjustability, restraint, ergonomics, construction, innocuousness, and performance under impact to be provided by protective jackets, body and shoulder protectors to be worn by children, youths and adults of either sex while riding horses, working with horses, driving horses or being a passenger in a horse driven vehicle. Such protectors are intended to provide some protection against impacts due to falls from horses and vehicles, and impacts while on the ground due to a fall, or while working with a horse. Impacts may be against the ground or objects such as trees or vehicles, or impacts may be due to kicks, being trodden on or being crushed by a horse. The protectors covered by this Standard are not intended to provide complete protection against injuries in accidents involving severe torsion, flexion, extension or crushing of the body. Requirements for marking and the provision of information are given.