Large CE1 D30 Back ProtectorsIcon D30 Back Protector Insert D3O may be a household name nowadays, but having spawned so many copycats you know the original was something special. Derived from non Newtonian tech, D3O is soft and pliable at rest, but becomes rigid when force is introduced. It's the best of both worlds. Ultimate comfort while its sitting on your back, rigid armor if you take a spill. You get more impact protection per square inch than pretty much any other kind of