WORLD WIDE EQUESTRIAN HELMET STANDARD
In the United States, conformity assessment of riding helmets to defined standards is performed primarily by the Safety Equipment Institute (SEI). 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. If the samples pass the tests, the producers may label other helmets of the same model and size to indicate that the helmet is ASTM/SEI certified. 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 helmet standard in Australian and New Zealand standard is AS/NZ 3838:2006.