Quote Originally Posted by StraightSix
LOL.

The M stands for Motorcycle. SA is special application. The difference is that the foam and lining of a SA helmet is fire retardant. The 2000, 2005, etc. is the year in which the certification was filed.

All helmets are subjected to testing by Snell Labs, iirc. Snell then certifies the helmet. Here's the web site for Snell, if you want to read up about the testing procedures.
Badass...so now my question is why would I want flame retardant...so my body can melt...BUT MY FACE IS FINE FTMFW!!!!

LoL, Jk JK, I know, they make flame retardant suits and stuff...it's just funnier if they pulled my crisp body from a car....BUT MY FACE IS MINT!