Must the helmet made up with the structure for strengthening be a top-grade helmet

Is the structure for strengthening helmet must be a top grade helmet? That’s not true.

The structure for strengthening is a kind of super-tough plastic material of which the main function is to prevent head from more serious injuries after the helmet is broken by absorbing the impacting and reversing conduction avoid the helmet being broken into fragments which may hurt our heads. While, actually, the component that will reduce the protecting function is generally used for the light and thin helmets. Under this circumstance, in most cases, only when the helmet designers would like to design some new styles is the material used to produce helmets. So,the helmet with structure for strengthening is not necessarily a high-grade helmet.