If you’re getting into autocross, you’ll be required to wear a helmet and not just any helmet will do. When looking to invest in a helmet for autocross, you’ll definitely want to follow the safety guidelines in your rulebook.
When it comes to approved helmets for autocross, the current minimum safety rating is Snell M2015 or Snell SA2015 according to the SCCA National Solo Rules.
Helmets with this safety approval are generally for motorcyclists, but there is a reason they are so popular: price.
Snell M rated helmets have a wide field of view compared to SA rated helmets. Depending on your area you will probably notice a lot of racers wearing these with the face shield removed. These helmets are typically a bit lighter than SA helmets, and offer more adjustability when it comes to ventilation - something those without AC can appreciate!
Helmets with this safety rating are going to be a bit more of an investment because they offer a bit more protection. SA rated helmets have a higher level of protection against impacts and fire. These helmets are required by the Snell Memorial Foundation to use flame retardant materials and pass harsher testing. SA helmets are more commonly the minimum when it comes to sanctioned drag racing, so if you plan on running the ¼ mile then these helmets might be more for you.