The Connect system has been designed to allow the user to combine and interchange Head, Face and Hearing accessories. The accessories are compatible with all the Centurion helmets. This adjustable chinstrap is an extra addition. If you are involved in tasks that demand head protection but also require freedom of movement then the S30E chinstrap will ensure the stability of your helmet. Centurion S30E Adjustable Chin Strap 2-point strap Elasticated Adjustable Chin Cup provides a secure fit