AJA660-000-0 harness knob for the JSP helmet. Circumference control system for comfortable fit and extra protection. Knob for adjusting the circumference of the main belt. Anti-sweat band in the front part for maximum sweat absorption. The product falls within category II of personal protective equipment. When placed inside an JSP helmet, it allows the helmet to be compliant with the requirements of EN397 and EN 50365.