The chin strap is usually equipped with an adjustment device, such as a buckle or clasp. When adjusting, first wear the safety helmet on your head and adjust the position and angle of the helmet clamp. Then, pull the free end of the chin strap and adjust the buckle or clasp to make the chin strap moderately elastic. It is advisable to wear it with a slight constraint on the chin, but without feeling uncomfortable. After adjustment, ensure that the buckle or clasp is securely locked to prevent the chin strap from loosening during use. For some safety helmets with dual chin strap designs, it is necessary to adjust both straps separately to ensure even force distribution and stable fixation of the helmet.