I buy off OGRacing.
M and SA designations are different. M is concerned with impact only. SA is impact + fire resistance, something bikers don't usually have to worry about.
I have the G-Force Pro 1, I think it's a great deal, but it is slightly on the heavy side. Though the lighter helmets are much more expensive.
G-Force Pro 1 would work well for anyone's first helmet. I matched mine up with a tinted blue visor for $40 more.
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