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derbyka said
on 9/2/2008 Safety standards are constantly changing and improving. So even if a helmet meets ASTM and SEI standards, it becomes "obsolete." It is recommended to replace a helmet every 4-5 years even if it has not been in a fall.
derbyka said
on 9/2/2008 Many hunter riders must ride with their hair in their helmets in the show ring. If this is the case, you should fit the helmet so that it fits properly/passes the tests with the hair in it. Then, when wearing that helmet, the rider should always have their hair up to ensure the fit stays the same.