Mogman
What man as done, man can do, what never has,maybe
When I was in Germany last year they had some helmets that didn’t have chin straps but had a clamp thing that clamped behind your head, then actually looked like them protos onesTry and wear a Protos for a couple of hours before buying one - I don’t like them at all tbh. I find them really uncomfortable and ended up going back to Petzl.