Per Section 4.3.1 of the SCCA Solo Rule book:
Helmets meeting the following standards must be worn while on course:
- Snell Memorial Foundation standards: EA 2016, SA2020, SA2015, SA2010, SAH2010, M2020D, M2020R, M2015, M2010, K2020, K2015, K2010;
- SFI standards 31.1/2020, 31.1/2015, 31.1/2010, 41.1/2020, 41.1/2015, 41.1/2010;
- FIA standards 8859-2020, 8860-2018, 8860-2018-ABP, 8859-2015, 8860-2010.
Full face or modular helmets shall be worn while competing in an open-wheel car, formula car, or kart.
Face shield, goggles, or similar face protection (conventional eyeglasses are not sufficient) shall be worn while competing in any other vehicle with less than the standard-size windshield.
For maximum protection, helmets must fit securely and should provide adequate peripheral vision. The chin strap must be securely fastened.
Loaner helmets should be available to vehicle occupants not having their own.
