Things have changed a lot in the last few years in understanding head injury and helmet construction, testing and standards. Snell used to be the “go to” standard but with the Euro standards and DOT much more rigorous everything is different.
There are a lot opinions out there, especially on the internets. The credible standards can be trusted, I think. Much on the internet cannot be. I think.
This is a bit from the site:
Kali Protectives came from a breakthrough in safety technology - COMPOSITE FUSION, a process that bonds the helmet shell and foam enabling us to use a thinner shell, creating a lighter stronger helmet.
Lighter and stronger means a safe helmet with less mass attached to your head. In a crash, less mass attached to your head reduces impact g-forces acting on your brain.
No safety technology exists that can completely prevent injury, but we can significantly reduce the chance of trauma. Are we as helmet manufacturers doing enough? The more we learn and the more we understand, the better protective gear we can produce.
That is our goal at Kali - to deliver the best protection available to riders.
https://kaliprotectives.com/pages/the-future-of-protectives