Per the 2025 SCCA Solo Rules, the following helmets are allowed:

4.3.1 Helmets
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; SFIstandards 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.

A SNELL helmet rating is a certification issued by the Snell Memorial Foundation, which sets high safety standards for helmets used in motorsports, cycling, and other high-impact activities. The foundation updates its standards every five years, ensuring that certified helmets meet the latest safety advancements and testing methodologies. According to the SNELL SA2025 Schedule:

October 1, 2025 – Snell SA2025 will take effect, the first SA2025 labeled helmets may be advertised, displayed and sold as of this date. There should be no SA2025 labeled headgear or claims for such until this date.

If your helmet has a SNELL SA2010 (or equivalent age) certification, it will no longer be valid for SCCA competition after 2025.