Riders desire lighter helmets for evident reasons. In practice, something below about 300g is light sufficient that its bodyweight won't be annoying, but the best highway biking helmets are sometimes quite a bit lighter than that. The shell is Fiberglass and DuPont™ Kevlar® fiber building, with an aerodynamic shell profile https://elliotkfysm.blog-kids.com/26652359/the-motorcycle-helmets-diaries