For high-altitude workers or in some special work environments, the back neck brace of the safety helmet is very necessary. The back neck brace can further secure the safety helmet in place at the head, preventing it from slipping off when the body shakes, tilts forward or backward, or is pulled by external forces. Especially during high-altitude operations, if the safety helmet slips off, it may lead to serious safety accidents. The combination of a neck brace and chin strap can stabilize the helmet from both front and back directions, providing more reliable protection for the head and reducing safety risks caused by helmet displacement.