I just been through several helmets in search for a new one.
I have a reasonable standard head size 59cm and not shaped in a wind tunnel.
Specialized helmets are too narrow, even the large is not wide enough.
Bell is not wide enough unless chosing extra large, which then does only sit almost...
Nanotechnology containing carbon is very possibly dangerous for the environment and the people using it, especially if the coating of the product is damaged and the carbon is exposed (to skin / environment). If broken and particles inhaled, they behave like asbestos...
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