October 10th, 2007
Louis and Chmee donned impact armor: leathery stuff, not unpleasantly stiff, which would go rigid as steel under impact from spear, arrow, or bullet.
From The Ringworld Engineers by Larry Niven, 1985.
d3o technology is a specially engineered material with intelligent molecules that flow with you as you move but on shock lock together to absorb impact energy.
From the d3o lab, 2007