FRP is better than ABS. It is lighter and stronger, but it is also more difficult to make. The output is lower, so it is much more expensive than ABS. The inner side of the helmet must be equipped with an anti impact pad. The surface pad material matching the head is thin mesh lining, which should have the effect of absorbing sweat and oil from the head. In addition, a ventilation slot with a depth of more than 10MM shall be provided on the liner to allow air circulation in the helmet.