Fox Racing 2013 Youth V1 Helmet - Rockstar [obs]
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The SA standard was designed for competitive auto racing while the M standard was for motorcycling and other motorsports. The K standard was released to accommodate helmets used in karting. There are three major differences between them : The SA standard requires flammability test while the M and K standards do not. The SA and K standards allow for a narrower visual field than the M standard (Some SA and K certified helmets may not be street legal).The SA and K standards include a rollbar multi-impact test while the M standard does not.