A close reading of the enclosed indicates Snell 2005 is valid until 12/31/2020.
https://www.scca.com/downloads/48190-20 ... 8/download
If you have trouble with that link, see Helmet Certification Chart here:
https://www.scca.com/pages/solo-cars-and-rules
2020 Helmet Rules
Moderator: Mike Simanyi