Norrona D3O core patented technology removable back-protector is based on non-Newtonian principles. Norrona D3O core patented technology removable back-protector is based on non-Newtonian principles. In standard conditions, the polymer chains on a Non-Newtonian fluid flow freely, allowing the material to remain soft and flexible but on impact, they lock together dissipating the impact energy, reducing the force transmitted. This event lasts milliseconds; the polymer then instantly returns to its flexible state. The D3O patented technology incorporates this Non-Newtonian into other polymers for a rate sensitive solution.