Alien Armor

The Kra'Vak are an unknown race, there for materials that they use for armor
may be of a metal or alloy that is beyound human technology. As with any
industrial civilisation new metals and alloys are developed. So lets say that
the humans find a metal and with their tech know how an armor with a mass of 1
or 2 is developed. But an alien race finds the same metal and their tech know
how is higher they develope an alloy from this metal to produce armor that has
a mass of less than.1. It is the same as here with us at the present time. The
advances made with tank armor just from the end of WW 2 to present. A little
story. When I was in Nam in 1972 we had a flak jacket that weight about 10
pounds. Today they use a flack jacket that weights only 2 pounds. The
difference is that in 1972 there was no kevlar. Kevlar was not introduced
untill 1973 and then the only military use was by the Isralies. So just trying
to figure out what kind of armor and the mass of it by almost any alien race
with a higher level of technology and exotic metals can be a real head ache.