Before going to the MIPS facility, the guiding lights that I would offer to helmet purchasers were fairly simple: your best sources for crash data are
SHARP in the UK and
CRASH in Australia, as they are independent bodies that are crash-testing helmets in their own facilities.
From their results,
I have seen little correlation between high-testing crash results and the upward price of a helmet,
though there does seem to be an inverse trend (with more than a few exceptions) between weight and crash scores.
Generally speaking, the heavier the helmet, the better the score.
The whole “$100 head, $100 helmet” maxim is almost entirely marketing-speak to get you in a more expensive lid.
I would also add two final caveats: one, that helmets with built-in visors and other similar features do so typically at the expense of added impact foam; and two, that the size of the visor mounting system can have great effect on a helmet’s side impact test results.
Outside of all these constraints, I have seen very little evidence that any one brand stands head-and-shoulders above another in terms of head safety. That has changed with MIPS, however.
Now, my advice to motorcycle helmet shoppers is simple: find a helmet that fits your head, is comfortable to wear for a duration, and has a rotational energy mitigation technology like MIPS – and of which, MIPS has out-shined its competitors when it comes to levels of available research and science.