I have this .
http://forums.pelicanparts.com/porsche-911-technical-forum/1048579-my-latest-project.html
Without the eye and ear protection it’s remarkably light compared to most hard hats .
It cost about 120 , and I’m not sure how long it will last in California sun , but if the insides wear out they can be replaced for around 20 bucks .
I also have a plastic hat called “serpent Vented ” made by pyramex That is probobly the best and lightest plastic one I’ve had .
Around 20 bucks on amazon etc.
It’s about the same weight as the carbon fiber one , but that’s purely down to the weight of the suspension in the carbon shell .