very lightweight, don't know where they classify it to be carbon fiber, it is really styrofoam and kinda cheap, not bad looking, but, as far as protection if you ride around a few blocks as I only do it's ok. If you are an avid traveler by bicycle this helmet is not 4-you folks. Honest opinion here.
I never had a chance to wear the very thin/light helmet as it arrived cracked on thenback, giving me no confidence it would protect my noggin. No brand was on the helmet so I am not sure it is a trusted manufacterer.
The helmet is very light weight. It does not come down very far on the head and the shell is not very thick. The foam interior seems to be good. Sadly, the only way to really test these helmets is to have an accident.