Helmets
Drivers of all 8.59 or quicker cars, including all motorcycles, must wear a helmet meeting Snell 90 or Newer,
or SFI 31.1,31.2 specs. Snell K-98 is acceptable in place of any Snell M-rated helmet.
What are the differences between the SA, M and K standards?
The SA standard was designed for competitive auto racing while 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:
1. The SA standard requires flammability test while the M and K standards do not.
2. The SA and K standards allow for a narrower visual field than M standard (Some SA and K certified helmets may not be street legal).
3. The SA and K standards include a rollbar multi impact test while M standard does not
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