Snell SA vs. Snell M

["John Burrows" <jnburrows@domain.elided>]

Three major differences btw Snell SA and M rated helmets accordig to the
FAQ on the Snell Memorial Foundation's website (www.smf.org):

1. SA standard requires flammability test while the M standard does not;

2. SA standard allows narrower visual field than M standard (Some SA
helmets may not be street legal); 
3. SA standard has rollbar impact test while M standard does not. 

Cheers,
John
Seattle, WA

1973 2000 GT Veloce
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