Merlin D30 CE Level 1 Back Protector - OrangeMerlin D30 CE Level 1 Back Protector D3O is an intelligent shock absorbing material containing intelligent molecules that flow freely when moving slowly, but on shock, lock together to absorb impact energy. D3O does not go hard upon impact; the molecules lock together like a net that both absorbs and spreads impact energy. D3O is very soft and flexible and provides an almost invisible shock absorption system that is a superior alternative to