http://cdn.growassets.net/user_files/sc ... cember.pdf
Most of us use Snell-rated helmets, and the rule normally only allows the current and preceding two Snell standards. The Snell 2015 standard just came out, but the SCCA agreed to allow one more year of legality for Snell 2000 (M2000 or SA2000).
All helmets meeting the latest or two immediately preceding Snell Foundation standards (SA2015, SA2010, SAH2010, SA2005, SA2000, M2015, M2010, M2005, M2000, K2010, K2005, K98), SFI standards 31.1, 41.1, 31.1A, 31.2A, 41.1A, 41.2A, ECE R22-05, or British spec BS6658-85 type A/FR are acceptable.”
In addition, the SEB has approved an extension of eligibility for Snell 2000 helmets to 1/1/2017, so the “SA2000” and “M2000” references in the above rule will remain in place for 2016.