SNELL "SA" testing.
Along with the regular requirements and testing done on the "M" rated helmets,
the "SA" standards and testing consist of...
1. Nomex liner and chin straps.
2. Nitrogen filled foam rubber.
3. Extra thick face shield.
4. Flame retardant paint.
5. Extended impact testing.For those overseas competitors; from the inquiries I've made it appears neither the British, Japanese, or European Standards organizations have a similar rating.
So, all helmets in streamliner classes must have SNELL SA rating.
The following is a list of helmet brands who sell a line that is SA approved.
1. ARAI racing helmets
2. Bell helmets
3. G-FORCE helmets
4. Pyrotect racing helmets
5. Zamp racing helmetsHope this helps, and best of luck to everyone.