Board Thread:Speculation House/@comment-24772070-20161204040824/@comment-25396609-20161204050629

Jaune's armor is made of solid blocks of metal, that stuff tends to be heavy; whereas the weapons have much thinner individual components.

Titanium is a better bet; titanium is heavier than aluminum, but it is also stronger; so a thinner piece of titanium can be just as strong (or stronger) than a thicker bit of aluminum.

I wouldn't put the weight for Crescent Rose above 100 pounds honestly, between thin titanium sheets and ultralight polymer or carbon fiber materials (plus any other, more advanced materials they have access to because, frankly, they are miles ahead of our world in regards to military technology.)