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Yet Kask, a major ski and cycle helmet manufacturer discounts that MIPs offers any benefit? (From what I read due to a scalp naturally providing rotational etc).
Not arguing, just genuinely interested.
@chiroshi certainly agree it's better than nothing.
The first half of your statement is true, the second half is not.
Helmets reduce the amount your brain moves around by reducing the accelleration of your head when it hits something hard. That can be either linear through compression of the foam, or rotational through providing a slippier surface.
Helmets aren't perfect, they won't save you from everything, but they're a lot better than nothing at all.