Originally posted by 1stGenCRXer
I'm not sure I agree with your take on M helmets. SA helmets were designed to protect against short intensity multiple impacts, whereas M helmets were designed to protect against 1 hard, high speed impact followed by a few lower intensity impacts. With either helmet it should be replaced if it suffers any kind of heavy impact, like dropping it on the ground from standing level or [my personal fav 
] throwing it into a racecar in rage.
the core on those is just styrofoam like bicycle helmets right?