MY SA 2005 BANDIT IS GOOD UNTIL 2017 ..
SA=Special Application, fire retardant lining, racing applications
M= Motorcycle nylon lining
M and SA helmets are built differently, M are build for more abrasion resistance, IE road rash, where SA are build to protect from trauma IE hitting a bar different helmets for different uses, If you are riding a bike the M helmet is better than a SA if you are in car the SA is better choice
Competition Helmets: Helmets meeting SFI Specifications 31.1 (Open Face) and SFI 31.2 (Closed Face) are tested to the highest levels for impact attenuation, penetration resistance, flame resistance and retention capabilites of any helmet in the world. These specifications are very similar to the standards of Snell, which is another helmet standard-setting organization, and are comparable to the Snell "SA" rating.
Sportsman Helmets: Helmets meeting SFI Specifications 41.1 (Open Face) and SFI 41.2 (Closed Face) are tested to the same requirements as Competition Helmets, with the exception of flame testing. This allows for a more economical helmet, with no loss of performance in a non-fire situation. These helmets are comparable to the Snell "M" rating
Also,,,,,
http://www.ehow.com/info_7809247_dra...uirements.html