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I think the overall larger shell size of the 6d is a part of what hurts its ability to reduce rotational energy. Leatt has some data that shows a 10% increase in shell size amplified the rotational energy and resulted in a 30% increase of rotational energy transfer. Rotational energy is more likely to cause a worse injury than the other impacts. Leatt has data saying that 50 G's of force is needed for a concussion, and much less rotational energy can be deadly. I do not recall the exact number so I do not want to say one, but...

Curious how 6D responds. Fly, too. Their helmet tech is a similar design --- elastomers that create "float" in different layers of materials The performance differences across technology are clear, at least in this study. Testing at 17 MPH seems reasonable to me. Most of my impacts are low speed. If higher speed, I'd expect the study results to be even more pronounced. Conclusion w/ regards to safety outcomes: Buy ECE22.06 and MIPS. Don't worry about price.

Thanks for sharing! This defies all the marketing buzz we've been hearing for years! Adding pictures for those that won't read the article.