Original sentence: First, the design standards are set and approved by an organization with expertise in design, engineering and safety.Helmet manufacturers voluntarily provide samples of each model and size of helmet to the Safety Equipment Institute (SEI) for simulated crash testing using the test methods defined by the ASTM standard.Helmets are worn more often by English-style riders and are gaining acceptance as required headgear for children.Helmets must meet a defined safety standard to be certified for use in competition.However, it does not prescribe helmet design.ISO standards and ASTM/SEI standards are quite similar; the SEI is accredited to ISO/IEC Guide 65:1996 by the American National Standards Institute (ANSI) and the Standards Council of Canada (SCC).One example of a safety standard is ASTM F1163, which is a standard written by a volunteer committee of producers and users of equestrian helmets and published by ASTM International (ASTM) (formerly American Society for Testing and Materials).People who take their horses hacking or trail riding in certain parts of the world sometimes wear helmets.SEI also monitors the market for helmets fraudulently labeled as being ASTM/SEI certified;  for this purpose, SEI publishes a list of all the helmet models and sizes which it has certified.The standard defines performance criteria and test methods.Then, actual helmets are tested and certified by a separate organization with testing expertise.They are most widely accepted in fields such as horse racing, eventing or show jumping.They are required in eventing, in endurance riding and other types of competitions
Edited sentence: ASTM F1163 is a safety standard written by a volunteer committee of producers and users of equestrian helmets and published by ASTM International (ASTM).Helmet producers (manufacturers) voluntarily provide samples of each model and size of helmet to the Safety Equipment Institute (SEI) for simulated crash testing using test methods defined in ASTM F1163.Helmets are worn primarily by English-style riders and are gaining acceptance as required headgear for children.ISO standards and ASTM/SEI standards are quite similar.People who take their horses trail riding often wear a helmet as well.SEI also monitors the market for helmets fraudulently labeled as being ASTM/SEI certified;  for this purpose, SEI publishes a list of all the helmet models and sizes which it has in fact certified.The standard defines performance criteria and test methods; it does not prescribe helmet design