[mrmustang]

SA2000 has a fire resistant liner while the M2000 does not. The "M" designation does not stand for motorcycle. There are lots of different composite materials used to build helmets these days. Some are straight reinforced fiberglass, others are carbon fiber, and several combinations of the two in between. You then factor in the whether or not it has enough ventilation for you, or whether you want a forced ventilation system. Style, and size needed. No two (style/brand) helmets fit the same, never buy a helmet without first trying it on, or getting it properly fit to your skull. Many people will tell you otherwise, but let the truth be known, 75% of them most likely have helmets that do not fit properly to their heads


Bill S.